Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 1 GIO DC HNG PHC THI TH ( thi c 04 trang) THI TH I HC 2011 Mn thi: VT L; Khi A Thi gian lm bi: 90 pht, khng k thi gian pht . Cu 1:Mt mu qung cha cht phng x xdiCs13755. phng x ca mu l H0 = 3,3.109(Bq). Bit chu k bn r ca Cs l 30 nm. Khi lng Cs cha trong mu qung l: A. 1(g) B. 1(mg)C. 10(g) D. 10(mg) Cu 2:ChomchingmintrR=100 O,cundythuncmL=1tH,tincC=12t.10-4FHiu in thhai u onmchc tn s l 50 Hz. Pha cahiu in thhai u onmch so vi hiu in th gia hai bn t l A. Nhah hn 4tB. Nhanh hn 2tC. Nhanh hn 3t D. Nhanh hn 34t Cu 3: T trng do dng in xoay chiu ba pha (c tn s f) to ra c tn s quay l f '. Ta c h thc: A. f ' < f.B. f ' = 3f.C. f ' = f. D. f ' = 31f Cu 4:Khi tng hp hai dao ng iu ho cng phng cng tn s c bin thnh phn 4cm v 4 3 cm c bin tng hp l 8cm. Hai dao ng thnh phn A. Cng pha vi nhau. B. Lch pha 3t.C. Vung pha vi nhauD. Lch pha 6t. Cu 5:Trong phng x anpha A.Ht nhn con li 1 trong bng tun hon so vi ht nhn m B. Ht nhn con tin 1 trong bng tun hon so vi ht nhn m C. Ht nhn con tin 2 trong bng tun hon so vi ht nhn m D.Ht nhn con li 2 trong bng tun hon so vi ht nhn m Cu 6:Chn cu sai khi ni v ng c khng ng b ba pha: A.T trng quay c to ra bi dng in xoay chiu ba pha. B. Stato c ba cun dy ging nhau qun trn ba li st b tr lch nhau 1/3 vng trn. C. T trng tng hp quay vi tc gc lun nh hn tn s gc ca dng in. D.Nguyn tc hot ng da trn hin tng cm ng in t v s dng t trng quay. Cu 7:Hai dao ng iu ho cng phng cng tn s c bin A1=8cm ; A2=6cm. Bin dao ng tng hp c th nhn gi tr no sau y ? A. 48cmB.1cm C. 15cmD.8cm Cu 8:Hai l xo c cng l k1, k2 v mt vt nng m = 1kg. Khi mc hai l xo song song th to ra mt con lcdaongiuhovi1=10 5 rad/s,khimcnitiphailxothconlcdaongvi2= 2 30 rad/s. Gi tr ca k1, k2 l A. 100N/m, 200N/mB. 200N/m, 300N/m C. 100N/m, 400N/m D.200N/m,400N/m Cu 9:Mt sng c hc lan truyn trong mt mi trng vi phng trnh3sin( )6 24 6t du cmt t t= + . Trong d tnh bng mt(m), t tnh bng giy(s). Tc truyn sng l A. 5 m/s.B. 5 cm/s.C. 400 cm/s.D. 4 cm/s. Cu 10:Hai ngun sng c AB cch nhau dao ng chm nh trn mt cht lng, cng tn s 100Hz, cng pha theo phng vung gc vi mt cht lng. Vn tc truyn sng 20m/s.S im khng dao ng trn on AB =1m lA. 10 im B. 20 imC. 5 imD. 11 im Cu 11:Trong th nghim giao thoa ca Ing, khong cch hai khe S1, S2: a = 2mm, khong cch t hai khe ti mn D = 2m. Ngun sng dng trong th nghim gm hai bc x 1 = 0,4m v 2 = 0,5m. Vi b rng ca trng giao thoa L = 13mm, ngi ta quan st thy s vn sng c bc sng 1 v 2 trng nhau l: A. 9 vn.B. 3 vn.C. 7 vn.D. 5 vn THI S 1 Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 2 Cu 12:Trongthnghimgiaothoasngtrnmtnc,haingunABcchnhau9,4cmdaongcng pha. im M trn mt nc thuc on AB cch trung im ca AB 0,5cm lun khng dao ng. S im dao ng cc i trn AB lA. 10B. 7C. 9D. 11 Cu 13:Mt mch dao ng gm cun thun cm L v hai t C ging nhaumcnitip,khaKmchaiumttC(hnhv).Mch ang hot ng th ta ng kha K ngay ti thi im nng lng in trngvnnglngttrngtrongmchangbngnhau.Nng lng ton phn ca mch sau s: LC CK ` A. khng iB. gim cn 1/4C. gim cn 3/4D. gim cn Cu 14:Khi cng nh sng chiu ti b mt kim loi dng lm catot tng th: A. Dng quang in bo ha gim.B. ng nng ca cc electron quang in gim. C. ng nng ca cc electron quang in tng.D. Dng quang in bo ha tng Cu 15:Mtcon lc n khi lngmdao ng iuhovi bin gc o0. Biu thc tnh tcchuyn ng ca vt li o l: A. 2 2 20( ) v gl o o = B. 2 2 202 ( ) v gl o o = C. 2 2 20( ) v gl o o = + D. 2 2 202 (3 2 ) v gl o o = Cu 16:Mt l xo c khi lng khng ng k c cng k = 100N/m. Mt u treo vo mt im c nh, u cn li treo mt vt nng khi lng 500g. T v tr cn bng ko vt xung di theo phng thng ng mt on 10cm ri bung cho vt dao ng iu ha. Ly g = 10m/s2, khong thi gian m l xo b nn mt chu k lA.3 2ts.B. 5 2ts.C. 15 2ts.D.6 2ts. Cu 17:Bit khong thi gian gia 2 ln lin tip nng lng in trng bng nng lng t trng ca mch dao ng in t t do LC l 710s. Tn s dao ng ring ca mch l: A. 2 MHzB. 5 MHz C. 2,5 MHzD. 10MHz Cu 18:Mch nh hnh v, C = 318(uF), R bin i. Cun dy thun cm, inphai umcht 100 sin U u0t = (V),cng suttiu thcamch t gi tr cc i khi R = R0 = 50(O). Cm khng ca cun dy bng: A. 40(O)B. 100(O) C. 60(O)D. 80(O) Cu 19:Chn cu sai khi ni v MP xoay chiu ba pha v ng c khng ng b ba pha. A. C hai u c ba cun dy ging nhau gn trn phn v my v t lch nhau 1200.B.ng c khng ng b ba pha c rto l mt s khung dy dn knC.My pht in ba pha c rto l mt nam chm in v ta phi tn cng c hc lm n quay. D. ng c khng ng b ba pha c ba cun dy ca stato l phn ng. Cu 20:Mt khung dy quay u trong t trng Bvung gc vi trc quay ca khung vi tc n = 1800 vng/pht.Tithiimt=0,vctphptuyn n camtphngkhungdyhpvi Bmtgc300.T thng cc i gi qua khung dy l 0,01Wb. Biu thc ca sut in ng cm ng xut hin trong khung lA. 0, 6 cos(30 )6e t Vtt t = B.0, 6 cos(60 )3e t Vtt t = . C. 0, 6 cos(60 )6e t Vtt t = + .D.60cos(30 )3e t Vt= + . Cu 21:Mtvtdao ng iuho,khivtc li x1=4cm thvn tc 140 3 / v cm s t = ; khivtc li 24 2 x cm =th vn tc 240 2 / v cm s t = . ng nng v th nng bin thin vi chu k A. 0,1 sB. 0,8 sC. 0,2 sD. 0,4 s R CL Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 3 Cu 22:t mt in p xoay chiu vo hai u on mch RLC ni tip c R thay i th thy khi R=30O v R=120O th cng sut to nhit trn on mch khng i. cng sut t cc i th gi tr R phi l A. 150 OB. 24OC. 90OD. 60O Cu 23:t in p xoay chiu vo hai u on mch RLC ni tip c C thay i th thy khi 410C Ft=v 4102C Ft=th in p hiu dng t vo t C khng i. in p hiu dng t cc i th gi tr C l A. 43.104C Ft= B. 4103C Ft= C.43.102C Ft= D.42.103C Ft=Cu 24:Cho on mch xoay chiu gmbin tr R mc ni tip vi mt t c in dung C =() Ft410 . t vo hai u on mch mt in pxoay chiu n nh c tn s f = 50 Hz . Thay i R ngi ta thy ng vi 2 gi tr ca R l R1 v R2 ; R1=R2, th cng sut ca mch bng nhau. Tch(R1. R2) bng A. 10 B. 102 C. 103 D. 104

Cu 25:Chn pht biu sai khi ni v nh sng n sc: A. nh sng n sc l nh sng c mu sc xc nh trong mi mi trng. B.nh sng n sc l nh sng c tn s xc nh trong mi mi trng. C.nh sng n sc l nh sng khng b tn sc. D. nh sng n sc l nh sng c bc sng xc nh trong mi mi trng. Cu 26:Kt lun no sau y l sai. Vi tia T ngoi: A. Truyn c trong chn khng.B. C kh nng lm ion ho cht kh. C. Khng b nc v thu tinh hp th.D. C bc sng nh hn bc sng ca tia tm. Cu 27:onmchgmbin tr Rmcni tipvimttc indung 0,1/t(mF). tvo haiu on mch mt in p xoay chiu n nh c tn s 50 Hz. Thay i R ngi ta thy vi 2 gi tr ca R l R1 v R2 th cng sut ca mch bng nhau. Tch R1.R2 bngA. 10 O2B. 100 O2 C. 1000 O2D. 10000 O2 Cu 28:Trong th nghim Ing v giao thoa nh sng, khong cch gia hai khe l a=1,5mm, khong cch t hai khe nmn l D=1,5m v ngun sng pht hai bcx c bc sng 1=480nm v 2=640nm. Kch thc vng giao thoa trn mn l p=2cm (chnh gia vng giao thoa l vn sng trung tm) S vn sng quan st c trn mn lA. 54. B. 72.C. 61. D. 51.Cu 29:Trong cc loi: Phtn, Mzon, lepton v Barion, cc ht s cp thuc loi no c khi lng ngh nh nht: A. phtnB. leptnC. mzonD. barion Cu 30:nh sng phtquangcamt schtc bc sng 0,50m. Hi nuchiuvocht nh sngc bc sng no th n s khng pht quang? A. 0,35 mB. 0,40 mC. 0,55 mD. 0,50 m Cu 31:Mt mch dao ng LC l tng gm cun thun cm L v hai t C ging nhau mc ni tip. Mch ang hot ng th ngay ti thi im nng lng in trng v nng lng t trng trong mch bng nhau, mt t b nh thng hon ton. Dng in cc i trong mch sau s bng bao nhiu ln so vi lc u ? A. khng i B. C. 0,5 3D. Cu 32:Mt mch dao ng gm mt t c in dung C = 10F v mt cun cm c t cm L = 1H, ly 2 =10. Khong thi gian ngn nht tnh t lc nng lng in trng t cc i n lc nng lng t bng mt na nng lng in trng cc i l A.1400 s .B.1300s.C.1200s.D. 1100s. Cu 33:Catt ca 1 t bo quang in c cng thot A = 2,9.10-19 J, chiu vo catt ca t bo quang in nh sngc bc sngm u 4 , 0 = .Tm iukinca hiuin thgiaantvcattcng dng quang n trit tiu .ChoC e s m c Js h19 8 3410 . 6 , 1 ; / 10 . 3 ; 10 . 625 , 6 = = =A.V UAK29 , 1 s B.V UAK29 , 1 = C.V UAK72 , 2 = D.V UAK29 , 1 =Cu 34:Chiuchmnscc =0,4 u mvocatotcatboquangin.Cngsutnhsngmcatot nhn c l P = 20 mW. S photon ti p vo catot trong mi giy l A. 8,050.1016 B. 2,012.1017C. 2,012.1016D. 4,025.1016

Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 4 Cu 35:nh sng hunh quang l nh sng: A.Tn ti mt thi gian di hn 10-8 s sau khi tt nh sng kch thch. B. Hu nh tt ngay sau khi tt nh sng kch thch. C. C bc sng nh hn bc sng nh sng kch thch. D.Do cc tinh th pht ra, khi c kch thch bng nh sng Mt Tri. Cu 36:Nguyn t hir trng thi c bn c kch thch v c bn knh qu o tng ln gp 9 ln. Cc chuyn di qu o c th xy ra l A. t M v KB. t M v LC. t L v KD. c a,b v c u ng Cu 37:C 2 cht phng x A v B vi hng s phng x A v B . S ht nhn ban u trong 2 chtl NA vNB . Thi gian s ht nhn A & B ca hai cht cn li bng nhau lA.lnA B AA B BNN B. 1lnBA B ANN + C. 1lnBB A ANN D.lnA B AA B BNN +

Cu 38:Trong qu trnh dao ng iu ha ca con lc n. Nhn nh no sau y l sai? A. Khi qu nng im gii hn, lc cng dy treo c c ln ca nh hn trng lng ca vt B. ln ca lc cng dy treo con lc lun ln hn trng lng vt. C.Chu k dao ng ca con lc khng ph thuc vo bin dao ng ca n. D. Khi khi gc hp bi phng dy treo con lc v phng thng ng gim, tc ca qu nng s tng Cu 39:Chn cu sai A.Tia - gm cc lectrn nn khng th phng ra t ht nhn B. Tia + gm cc ht c cng khi lng vi lectrn v mang in tch nguyn t dngC. Tia gm cc ht nhn ca nguyn t hliD.Tia lch trong in trng t hn tia Cu 40:Sau1nm,khilngchtphngxgimi3ln.Hisau2nm,khilngchtphngxtrn gim i bao nhiu ln so vi ban u. A. 9 ln. B. 6 lnC.12 ln.D.4,5 ln Cu 41:Khi thy sao chi xut hin trn bu tri th ui ca n quay v hng no A. Hng mt tri mc.B. Hng mt tri ln. C. Hng Bc.D. Hng ra xa mt tri. Cu 42:Hin tng giao thoa sng xy ra khi cA. Hai sng chuyn ng ngc pha nhau. B.Hai sng xut pht t hai ngun dao ng cng tn s, cng bin giao nhau. C.Hai sng dao ng cng chiu, cng pha gp nhau. D. Hai sng xut pht t 2 ngun dao ng cng tn s, cng pha giao nhau. Cu 43:Mthtnhnckhilngm=5,0675.10-27kgangchuynngvingnng4,78MeV.ng lng ca ht nhn lA. 2,4.10-20kg.m/s.B.3,875.10-20kg.m/sC.6,96.10-20kg.m/s.D. 7,75.10-20kg.m/s. Cu 44:Chiu ln lt cc bc x c tn s f, 3f, 5f vo catt ca t bo quang in th vn tc ban u cc i ca electron quang in ln lt l v, 3v, kv. Gi tr k l A.34 B. 5C.17 D. 15 Cu 45:UL, UR, UC ln lt l hiu in th 2 u L, R ,C trong mch RLC ni tip. lch pha gia u v i l tanm xc nh theo cng thc A.RLUU B.C LU U U C. CUUD. C LU UU

Cu 46:Mtcon lc lxo tnmnganggmvtmv lxo c cngk=100N/m. Kch thch vtdao ng iu ho vi ng nng cc i 0,5J. Bin dao ng ca vt l A. 50 cmB. 1cmC. 10 cmD. 5cm Cu 47:Mt sng c hc c bin A, bc sng . Vn tc dao ng cc i ca phn t mi trng bng 2 ln tc truyn sng khi A. = A.B. = 2A.C. = A/2.D. = A/4. Cu 48:Mt vt dao ng iu ha dc theo trc ox, quanh v tr cn bng o vi bin A v chu k T. Trong khong thi gian T/4, Qung ng ln nht m vt c th i c l: A. A2 B. AC. 3A/2D. A3Cu 49:Mt cht im dao ng iu ha theo phng trnh x = 3sin( 5tt + t/6)( tnh bng cm v t tnh bng giy). Trong mt giy u tin t thi im t = 0, Cht im i v tr c li x = +1 cm. Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 5 A. 4 lnB. 7 lnC. 5 lnD. 6 ln Cu 50:Mt con lc l xo c cng K = 100N/m dao ng iu ha vi bin A = 5cm. ng nng ca vt nng khi n lch khi v tr cn bng mt on 3cm l: A. 0,016JB. 0,08JC. 16JD. 800J P N 1 1B2A3C4C5D6C7D8B9D10A 11C12A13C14D`15A16C17C18C19D20B 21A22D23A24D25D26C27D28C29A30C 31A32A33A34D35B36D37C38B39D40A 41D42D43C44C45B46C47A48A49C50B Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 6 GIO DC HNG PHC THI TH ( thi c 04 trang) THI TH I HC 2011 Mn thi: VT L; Khi A Thi gian lm bi: 90 pht, khng k thi gian pht . Cu 1:Mtvtdaongiuho,khongthigiangiahailnlintipvtquavtrcnbngl0,5s; qungngvtictrong2sl32cm.Tithiimt=1,5svtquali2 3 x cm = theochiudng. Phng trnh dao ng ca vt l: A.8 os( )3x c t cmtt = B. 54 os(2 )6x c t cmtt = +C.8 os( )6x c t cmtt = + D.4 os(2 )6x c t cmtt = Cu 2: Mt con lc n dao ng iu ho, nu tng chiu di 25% th chu k dao ng ca n A. tng 25%B. gim 25%C. tng 11,80%D. gim 11,80% Cu 3:Mt vt dao ng iu ha theo phng trnh x = 5cos(2t)cm. Nu ti mt thi im no vt ang c li x = 3cm v ang chuyn ng theo chiu dng th sau 0,25 s vt c li l A. - 4cm.B. 4cm.C. -3cm.D.0. Cu 4:Nhn xt no sau y v dao ng tt dn l ng? A. C tn s v bin gim dn theo thi gian. B.Mi trng cng nht th dao ng tt dn cng nhanh. C.C nng lng dao ng lun khng i theo thi gian. D. Bin khng i nhng tc dao ng th gim dn. Cu 5:Chn pht biu sai v dao ng duy tr. A. C chu k bng chu k dao ng ring ca h. B.Nng lng cung cp cho h ng bng phn nng lng mt i trong mi chu k. C.C tn s dao ng khng ph thuc nng lng cung cp cho h. D. C bin ph thuc vo nng lng cung cp cho h trong mi chu k. Cu 6:Mt con lc l xo dao ng iu ho . Nu tng cng l xo ln 2 ln v gim khi lng i hai ln th c nng ca vt sA. khng iB. tng bn ln C. tng hai lnD. gim hai ln Cu 7:Mt con lc l xocm=200gdaong iu ho theo phng ng. Chiudi t nhincalxo l lo=30cm. Lyg=10m/s2. Khi l xocchiudi28cmth vn tc bngkhng v lc lc nhic ln 2N. Nng lng dao ng ca vt l A. 1,5JB. 0,1J C. 0,08JD. 0,02J Cu 8:Mt vt dao ng iu ho vi chu k T, ng nng ca vt bin i theo thi gian A. Tun hon vi chu k T. B.Tun hon vi chu k 2T. C. Ti mt hm sin hoc cosin. D.Tun hon vi chu k T/2. Cu 9:Mt vt dao ng iu ha vi tn s bng 5Hz. Thi gian ngn nht vt i t v tr c li x1 = - 0,5A n v tr c li x2 = + 0,5A l A.1/10 s.B.1/20 s.C.1/30 s.D.1 s. Cu 10:Chn cu sai khi ni v sng dng xy ra trn si dy: A. Hai im i xng vi nhau qua im nt lun dao ng cng pha. B.Khong cch gia im nt v im bng lin k l mt phn t bc sng. C.Khi xy ra sng dng khng c s truyn nng lng. D. Khong thi gian gia hai ln si dy dui thng l na chu k. Cu 11:Mt sng c hc lan truyn trong mt mi trng vi phng trnh 3sin( )6 24 6t du cmt t t= + . Trong d tnh bng mt(m), t tnh bng giy(s). Tc truyn sng l A. 5 m/s.B. 5 cm/s.C. 400 cm/s.D. 4 cm/s. Cu 12:Trn mt si dy di 1m (hai u dy c nh) ang c sng dng vi tn s 100Hz. Ngi ta thy c 4 im dao ng rt mnh. Vn tc truyn sng trn dy l THI S 2 Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 7 A. 200m/sB. 100m/sC. 25m/sD. 50 m/s Cu 13:Hin tng giao thoa sng xy ra khi cA. Hai sng chuyn ng ngc pha nhau. B.Hai sng xut pht t hai ngun dao ng cng tn s, cng bin giao nhau. C.Hai sng dao ng cng chiu, cng pha gp nhau. D. Hai sng xut pht t 2 ngun dao ng cng tn s, cng pha giao nhau. Cu 14:Chohaingunkt hp S1, S2 ginght nhaucchnhau 5cm.Sngdohai ngun nyto ra cbc sng 2cm. Trn S1S2 quan st c s cc i giao thoa lA. 9B. 7 C. 5D. 3 Cu 15:Khi mc t in c in dung C1 vi cun cm L th mch thu sng thu c sng c bc sng 1 = 60m; khi mc t in c in dung C2 vi cun cm L th mch thu c sng c bc sng 2 = 80m. Khi mc C1 ni tip C2v ni tip vi cun cm Lth mch thu c bc sng l: A. =100m.B. = 140m.C. = 70m.D. = 48m Cu 16:Tn s ca dao ng in t do my pht dao ng iu ho dng tranzito pht ra bng tn s ca A. Dao ng ring ca mch LC.B. Nng lng in t. C.Dao ng t do ca ng ten pht.D. in th cng bc Cu 17:Mt mch dao ng gm mt t c in dung C = 10F v mt cun cm c t cm L = 1H, ly 2 =10. Khong thi gian ngn nht tnh t lc nng lng in trng t cc i n lc nng lng t bng mt na nng lng in trng cc i l A.1400 s .B. 1300s.C. 1200s.D. 1100s. Cu 18:Ngun in mt chiu c sut in ng 3 V, np in t in c in dung C = 10 F, sau ni vi cun dy thun cm c t cm L = 1 mH to thnh mch dao ng. Cng hiu dng dng in trong mch bng A. 1414 mAB. 300 mA C. 2000 mAD. 212 mA Cu 19:T trng do dng in xoay chiu ba pha (c tn s f) to ra c tn s quay l f '. Ta c h thc: A. f ' < f.B. f ' = 3f.C. f ' = f. D. f ' = 31f. Cu 20:Hp kn (c cha t C hoc cun dy thun cm L) c mc ni tip vi in tr R = 40(O). Khi t vo on mch xoay chiu tn s f = 50(Hz) th hiu in th sm pha 45 so vi dng in trong mch. t cm L hoc in dung C ca hp kn l: A. t4103(F) B. 0,127(H)C. 0,1(H)D. 410 .3 t(F) Cu 21:Chn cu sai. A. My pht in c cng sut ln th rto l cc nam chm in B.MP m rto l phn cm th khng cn c b gp.C.Trong MP, cc cun dy ca phn cm v phn ng u c qun trn li thp D. Vi my pht in xoay chiu mt pha th nam chm phi l nam chm in Cu 22:Cho mt cun dy c in tr thun 40 O v c t cm 0,4/t (H). t vo hai u cun dy in p xoay chiu c biu thc: u = U0cos(100tt - t/2) (V). Khi t = 0,1 (s) dng in c gi tr -2,75 2(A). Ga tr ca U0 lA. 220 (V)B. 110 2(V)C. 220 2(V)D. 440 2(V) Cu 23:tvohaiumchinxoaychiugmmtcundyvmttinmcnitipmtinp xoaychiunnhc biuthcu =100 6 cos(100 )( ).4t Vtt +Dngvnkc in tr rt ln lnlt o in p gia hai u cun cm v hai bn t in th thy chng c gi tr ln lt l 100V v 200V. Biu thc in p gia hai u cun dy l: A. 100 2 cos(100 )( )2du t Vtt = + .B. 200cos(100 )( )4du t Vtt = + . C. 3200 2 cos(100 )( )4du t Vtt = + .D. 3100 2 cos(100 )( )4du t Vtt = + . Cu 24:Dng in xoay chiu i=2cos(110tt) A mi giy i chiu A. 100 lnB. 120 lnC. 99 lnD. 110 ln Cu 25:Vo cng mt thi im no hai dng in xoay chiu i1=I0cos(et+m1) v Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 8 i2=I0cos(et+m2) c cng tr tc thi 0,5I0, nhng mt dngin ang tng cn mt dng in ang gim. Hai dng in ny lch pha nhau A. 3 radtB. 23radtC. Ngc phaD. Vung pha Cu 26:t in p xoay chiu c tr hiu dng U=120V tn s f=60Hz vo hai u mt bng n hunh quang. Bit n ch sng ln khi in p t vo n khng nh hn 60 2 V. Thi gian n sng trong mi giy l: A. 12s B. 13s C. 23s D. 14sCu 27:Cng thc xc nhcng sut ca dng in xoay chiu l A. P = UIB. P = UISinm C. P = UICosm D. P = RU2 Cu 28:Mt in tr thun R=100O, khi dng dng in c tn s 50Hz. Nu dng dng in c tn s 100Hz th in tr s A. Gim 2 ln B. Tng 2 lnC. Khng iD. Gim 1/2 ln Cu 29:on mch AC c in tr thun, cun dy thun cm v t in mc ni tip. B l mt im trn AC vi uAB = sin100tt (V) v uBC =3sin(100tt - t2) (V). Biu thcuACl A. u AC = 2sin \

| 100tt -t3 .|| VB. ACu 2 2 sin(100 t) V = tC. ACu 2 sin 100 t V3t | |= t + |\ .D. ACu 2sin 100 t V3t | |= t + |\ . Cu 30:Trong th nghim Ing v giao thoa nh sng vi nh sng n sc, khong cch gia hai khe l 1mm, khong cch t hai khe ti mn l 2m. Trong khong rng 12,5mm trn mn c 13 vn ti bitmt u l vn ti cn mt u l vn sng. Bc sng ca nh sng n sc l A. 0,5mB. 0,46mC. 0,48mD. 0,52m Cu 31:Tnh cht ni bt ca tia hng ngoi l: A. Tc dng nhit.B. B nc v thu tinh hp th mnh. C. Gy ra hin tng quang in ngoi.D. Tc dng ln knh nh hng ngoi Cu 32:Quang ph vch pht x l mt quang ph gm A. Mt s vch mu ring bit cch nhau bng nhng khong ti.B.Mt vch munm trn nn ti. C.Cc vch t ti tm cch nhau nhng khong ti. D. Cc vch ti nm trn nn quang ph lin tc. Cu 33:TrongthnghimgiaothoanhsngvihaikheY-ngcchiusngbngnhsngnscc bc sng , khong cch hai khe l a, khong cch t hai khe n mn l D. Trn mn quan st c h vn giao thoa. Khong cch t vn sng bc ba n vn ti th nm cng mt pha ca vn trung tm l A. Da.B. 2 Da.C. 3 D2a.D. 3 Da. Cu 34:Trong giao thoa nh sng, ti v tr cho vn ti nh sng t hai khe hp n v tr c A. lch pha bng chn ln B.Hiu ng truyn bng l ln na bc sng. C.Hiu ng truyn bng nguyn ln bc sng. D. lch pha bng l ln /2. Cu 35:C th lm tng cng dng quang in bo ho bng cch : A. Gi nguyn bc sng nh sang kch thch, tng cng chm sng kch thch B.Gi nguyn cng chm sng, gim bc sng nh sng kch thch C.Gi nguyn cng chm sng, tng bc sng nh sng kch thch D. Tng hiu in th gia anot v catot Cu 36:Mt ng rnghen cin p gia ant v katt l 2000V, cho h = 6,625.10-34 Js, c = 3.108m/s. Bc sng ngn nht ca tia rnghen m ng c th pht ra l A. 4,68.10-10mB. 5,25.10-10mC. 3.46.10-10m D. 6,21.10-10m Cu 37:nh sng ln quang l nh sng Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 9 A. c pht ra bi c cht rn, lng v kh. B.C th tn ti trong thi gian di hn 10-8s sau khi tt nh sng kch thch. C.C tn s ln hn tn s ca nh sng kch thch. D. Hu nh tt ngay sau khi tt nh sng kch thch. Cu 38:Chiu mt chm sngt ngoi c bc sngm u 25 , 0vo mt l Volfram c cng thot 4,5eV. Bit khi lng lctrn l me = 9,1.10-31 kg. Vn tc ban u cc i cacc elctrn quang inkhi bn ra khi mt l Vonfram l:A. 4,06.105 m/s; B.3,72.105 m/s; C. 4,81.105 m/s;D. 1,24.106 m/s. Cu 39:Hin tng quang in l A. Hin tng lctrn bt ra khi b mt kim loi khi c nh sng thch hp chiu vo n. B.Hin tng lctrn bt ra khi b mt kim loi khi tm kim loi b nung nng n nhit rt cao. C.Hintng lctrn bt rakhi bmt kimloi khi tmkim loi b nhim indo tipxcvimt vt b nhim in khc. D. Hin tng lctrn bt ra khi b mt kim loi do bt k mt nguyn nhn no khc. Cu 40:Khi chiu nh sng c bc sngvo katt ca t bo quang in th e bt ra c v0max = v, nu chiu ' = 0,75 th v 0 max = 2v, bit= 0,4m. Bc sng gii hn ca katt l A.0,42mB. 0,45mC . 0,48mD. 0,51mCu 41:Cho phn ng ht nhn: 73p Li 2 17, 3MeV + o + . Cho NA = 6,023.1023 mol-1. Khi to thnh c 1g Hli th nng lng ta ra t phn ng trn l A.13,02.1023MeV.B. 26,04.1023MeV.C. 8,68.1023MeV.D. 34,72.1023MeV. Cu 42:Ht nhn 21084Po l cht phng x o. Sau khi phn r, ht nhn con sinh ra cA.84 proton v 126 ntron.B.80 proton v 122 ntron. C.82 proton v 124 ntron.D.86 proton v 128 ntron. Cu 43:Mt tng c bng g c phng x b gim 75 ln so vi phng x ca 1 khc g cng khi lng v va mi cht. ng v C14 c chu k bn r T = 5600 nm. Tui ca tng g bng: A. 5600 nmB. 11200 nmC. 16800 nmD. 22400 nm Cu 44:Sau 10 ngy, s nguyn t ca mt cht phng x gim i 3 / 4 so vi lc u. Chu k bn r ca cht phng x ny l A. 6 ngy B. 4 ngyC. 3 ngyD. 5 ngy Cu 45:Bom nhit hch dng phn ng: D + T o + n. Bit khi lng ca cc ht nhn D, T v o ln lt l mD = 2,0136u, mT = 3,0160u v mo = 4,0015u; khi lng ca ht n l mn = 1,0087u; 1u = 931 (MeV/c2); s Avogadro NA = 6,023.1023. Nng lng to ra khi 1 kmol heli c to thnh l A. 1,09. 1025 MeV B. 1,74. 1012 kJC. 2,89. 10-15 kJD. 18,07 MeV Cu 46:Phn ng sau y khng phi l phn ng ht nhn nhn to A. 238 4 23492 2 90U He Th + B. 27 30 113 15 0Al P n o + + C. 4 14 17 12 7 8 1He N O H + + D. 238 1 23992 0 92U n U + Cu 47:Hnh tinh no trong cc hnh tinh sau y gn Mt Tri nht ? A. Sao KimB.Sao HaC. Sao ThD. Tri t Cu 48:Tng tc gia cc hadron, nh tng tc gia cc nucln trong ht nhn gi l: A. tng tc in tB. tng tc hp dn C. tng tc yuD. tng tc mnh Cu 49:Khong thi gian ngn nht gia hai ln Wd = Wt khi mt vt dao ng iu ho l 0,05s. Tn s dao ng ca vt l: A. 2,5HzB. 3,75HzC. 5Hz D. 5,5HzCu 50:Khi ni v my bin p, biu thc no sau y ng? A. i 1/i 2 = N 1/ N 2 B. i 1/i 2 = N 2/ N 1 C. N 1/ N 2 = U 1/U 2 D. . i 1/i 2 = U 2/U 1 Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 10 P N 2 1B2C3B4B5B6C7C8D9C10A 11C12D13D14C15D16A17A18D19C20B 21D22C23D24D25B26C27C28C29A30A 31A32A33C34B35A36D37B38A39A40B 41A42C43B44D45B46A47A48D49C50C Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 11 GIO DC HNG PHC THI TH ( thi c 04 trang) THI TH I HC 2011 Mn thi: VT L; Khi A Thi gian lm bi: 90 pht, khng k thi gian pht . Cu 1:t vo hai u on mch RLC khng phnnhnhin pu = 100 2 cos 100tt (V) th dng in qua mch l i =2 cos 100tt (A). Tng tr thun ca on mch lA. R = 200O.B. R = 50O.C. R = 100O.D. R = 20O. Cu 2:Vn tc truyn sng trong mt mi trng ph thuc voA.bin ca sng.B.cng ca sng. C.tnh cht ca mi trng. D.tn s ca sng. Cu 3:Chn pht biu sai. Mch in RLC ni tip ang xy ra cng hng. Nu tng L mt lng nh th: A. in p hiu dng trn in tr gim.B. Cng sut to nhit trn mch gim. C. in p hiu dng trn t in tng.D. in p hiu dng trn cun cm thuntng. Cu 4:Chn cu sai A. Mt cht phng x khng th ng thi pht ra tia anpha v tia bta B.C th lm thay i phng x ca mt cht phng x bng nhiu bin php khc nhauC.Nng lng ca phn ng nhit hch ta ra trc tip di dng nhit D. S phn hch v s phng x l cc phn ng ht nhn ta nng lng Cu 5:Chiungthihainhsngnsc1=0,5mv2=0,6mvohaikheY-ngcchnhau2mm, mn cch hai khe 2m. Cng thc xc nh to ca nhng vn sng c mu ging vn trung tm l (k nguyn)A. x = 5k(mm)B. x = 4k(mm) C. x = 3k(mm)D. x = 2k(mm Cu 6:Mt con lc l xo ngang gm l xo c cngk=100N/m v vt m=100g, dao ng trn mt phng ngang, h s ma st gia vt v mt ngang l u=0,02. Ko vt lch khi VTCB mt on 10cm ri th nh cho vt dao ng. Qung ng vt i c t khi bt u dao ng n khi dng hn l A. s = 50m. B. s = 25m C. s = 50cm.D. s = 25cm. Cu 7:Mt vt dao ng iu ho c phng trnh cali : x = A sin(e t+ ) m .Biu thc gia tc ca vt lA. a = -2e xB.a = -2e v C. a = -2e A sin2(e t+ ) m .D.a = -2eCu 8:Sng truyn t O n M vi vn tc v = 40cm/s, phng trnh sng ti O l u = 4sint/2(cm). Bit lc t th li ca phn t M l 2cm, vy lc t + 6 (s) li ca M l A. -2cm B. 3cmC. -3cmD. 2cm Cu 9:MilinhgiainpphaUpvinpdyUdtrongcchmchnhsaomyphtinxoay chiu ba pha. A. Ud= 3 Up.B. Up= 3 Ud.C. Ud=Up.D. Ud=3Up. Cu 10:GiaothoakheI-ngvinhsngtrngcbcsngbinthint4.10-7mn7,6.10-7m.Haikhe cch nhau a=1mm v cch mn 1m. rng quang ph bc 3 l: A. 1,2mmB. 1,08mmC. 2,28mmD. 1,2mm v 2,28mm Cu 11:Tia hng ngoi v tia Rnghen c bc sng di ngn khc nhau nn chng A. C bn cht khc nhau v ng dng trong khoa hc k thut khc nhau. B.B lch khc nhau trong t trng u. C.B lch khc nhau trong in trng u. D. Chng u c bn cht ging nhau nhng tnh chtkhc nhau. Cu 12:Hin tng quang in trong l hin tng A. Bt electron ra khi b mt kim loi khi b chiu sng. B.Gii phng electron khi kim loi bng cch t nng.C.Gii phng electron khi mi lin kt trong bn dn khi b chiu sng. D. Gii phng electron khi bn dn bng cch bn ph ion. Cu 13:Mtvtdao ng iuho,khivtc li x1=4cmthvn tc 140 3 / v cm s t = ; khivtcli 24 2 x cm =th vn tc 240 2 / v cm s t = . ng nng v th nng bin thin vi chu k A. 0,1 sB. 0,8 sC. 0,2 sD. 0,4 s THI S 3 Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 12 Cu 14:Mt vt dao ng iu ha, trong 1 pht thc hin c 30 dao ng ton phn. Qung ng m vt di chuyn trong 8s l 64cm. Bin dao ng ca vt l A. 2cmB. 3cmC. 4cmD. 5cm Cu 15:Ti mt ni c hai con lc n ang dao ng vi cc bin nh. Trong cng mt khong thi gian, ngitathyconlcthnhtthchinc4daong,conlcthhaithchinc5daong.Tng chiu di ca hai con lc l 164cm. Chiu di ca mi con lc ln lt l A. l1= 100m, l2 = 6,4m. B. l1= 64cm, l2 = 100cm. C. l1= 1,00m, l2 = 64cm.D. l1= 6,4cm, l2 = 100cm. Cu 16:i lng sau y khng phi l c trng vt l ca sng m: A. to ca m.B. th dao ng m.C. Tn s m.D. Cng m Cu 17:Mt sng c hc c bin A, bc sng . Vn tc dao ng cc i ca phn t mi trng bng 2 ln tc truyn sng khi A. = A.B. = 2A.C. = A/2.D. = A/4. Cu 18:Mt mch dao ng gm 1 t in C = 20nF v 1 cun cm L = 8 u H in tr khng ng k. in p cc i hai u t in l U0 = 1,5V . Cng dng hiu dng chy trong mch . A. 48 mA B. 65mAC. 53mA D. 72mA Cu 19:Chn tnh cht khng ng khi ni v mch dao ng LC: A. Nng lng in trng tp trung t in C.B.Nng lng t trng tp trung cun cm L. C.Nng lng in trng v nng lng t trng cng bin thin tun hon theo mt tn s chung. D. Dao ng trong mch LC l dao ng t do v nng lng in trng v t trng bin thin qua li vi nhau. Cu 20:Mt nng cmcvomng inxoaychiutn sf = 50(Hz),U = 220(V). Bit rng nch sng khi hiu in th gia hai cc ca n t gi tr u > 155(V). Trong mt chu k thi gian n sng l: A. 1001(s)B. 1002(s)C. 3004(s)D. 1005(s) Cu 21:Mt my pht inxoay chiu mt pha c rto gm 4 cp cc t, mun tn s dng in xoay chiu pht ra l 50 Hz th rtophi quay vi tc lA. 750 vng/pht B. 3000 vng/phtC. 500 vng/phtD. 1500 vng/pht Cu 22:t vo hai u mch in cha hai trong ba phn t gm: in tr thun R, cun dy thun cmc tcmL,tincindungCmthiuinthxoaychiunnhcbiuthcu=U0cos et(V)th cng dng in qua mch c biu thc i = I0cos( et - /4) (A). Hai phn t trong mch in trn l: A. Cun dy ni tip vi t invi ZL = 2ZC. B.Cun dy ni tip vi t in vi 2ZL = ZC. C.in tr thun ni tip vi cun dy vi R = ZL. D. in tr thun ni tip vi t in vi R = ZC. Cu 23:Mch in xoay chiu RLC khng phn nhnh c: R = 50O; L = t 107H;C = t 2103 F. t vo hai u on mch mt in p xoay chiu c tn s 50 Hz th tng tr ca on mch A. 50 O.B. 50 2 O.C. 50 3 O.D. 50 5

Cu 24:ChoonmchR,L,CnitipviLcththayic.TrongRvCxcnh.Mchin c t diin p u = U 2 sint. Vi U khng i v cho trc. Khi in p hiu dng gia hai u cun cm cc i. Gi tr ca L lA. L = R2 + 2 21C B. L = 2CR2 + 21CC. L = CR2 + 212C D. L = CR2 + 1Cw2

Cu 25:Trong mch in xoaychiukhngphnnhnh, inp gia hai u on mchvcng dng introngmchlnltl:u=100sin100tt(V)vi=100sin(100tt+t/3)(mA).Cngsuttiuthutrong mch lA. 5000WB. 2500WC. 50WD. 2,5W Cu 26:Thc hin giao thoa nh sng qua khe I-ng, bita= 0,5 mm, D = 2m. Ngun S pht nh sng gm cc bc x n sc c bc sng t 0,4 m u n 0,76 m u . S bc x b tt ti im M trn mn E cch vn trung tm 0,72 cm l Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 13 A.5.B. 4C. 2.D. 3. Cu 27:Chn pht biu sai v tia hng ngoi? A. Tia hng ngoi do cc vt b nung nng pht ra. B.Bc sng ca tia hng ngoi ln hn 0,75 m u . C.Tia hng ngoi lm pht quang mt s cht . D. Tc dng nhit l tc dng ni bt nht ca tia hng ngoi. Cu 28:Pht biu no trong cc pht biu sau y v tia Rnghen l sai? A. Tia Rnghen truyn c trong chn khng. B.Tia rnghen c bc sng ln hn tia hng ngoingoi C.Tia Rnghen c kh nng m xuyn. D. Tia Rnghen khng b lch hng i trong in trng v t trng. Cu 29:Nguyn t H ang trng thi c bn, b kch thch pht ra chm sng th chng c th pht ra ti a 3 vch quang ph. Khi b kch thch electron trong nguyn t H chuyn sang qu oA. OB. N C. LD. M Cu 30:. Mt tm kim loi c gii hn quang in ngoi 0=0,46m. Hin tng quang in ngoi s xy ra vi ngun bc xA. Hng ngoi c cng sut 100W.B. t ngoi c cng sut 0,1W. C. c bc sng 0,64m c cng sut 20W. D. hng ngoi c cng sut 11W. Cu 31: 2411Nalacha t pho ng xa|v i chu k ba n ra15 gi. Ban a u co1 l ng 2411Na , th sau khoa ng th i gian bao nhie u kho i lng cha t pho ng xatre n b pha n ra75%? A. 7,5 hB. 15hC. 22,5 hD. 30 h Cu 32:Ht o c ng nng 5,3 (MeV) bn vo mt ht nhnBe94 ng yn, gy ra phn ng:Be94 + o n + X. Ht n chuyn ng theo phngvung gc vi phng chuyn ng ca ht o. Cho bit phn ng ta ra mt nng lng 5,7 (MeV). Tnh ng nng ca ht nhn X. Coi khi lng xp x bng s khi. A. 18,3 MeV B. 0,5 MeVC. 8,3 MeV D. 2,5 MeV Cu 33:Trong phng trnh dao ng iu ho x = Acos(et +m). Chn cu pht biu sai: A. Bin A ph thuc vo cch kch thch dao ng. B.Bin A khng ph thuc vo gc thi gian. C.Pha ban u m ch ph thuc vo gc thi gian.D. Tn s gc e ph thuc vo cc c tnh ca h.. Cu 34:Hai dao ng iu ho cng phng cng tn s c phng trnh ln lt lx1= 5sin( )6tt t cm; x2= 5sin( )2tt t cm .Dao ng tng hp ca hai dao ng ny c bin A. 10cm B. 5 3 cmC. 5 cmD. 5 2 cmCu 35:Trn dyAB di 2m csng dngc hai bng sng,uA ni vi ngun dao ng (coil mt nt sng), u B c nh. Tm tn s dao ng ca ngun, bit vn tc sng trn dy l 200m/s. A. 50HzB. 25Hz C. 200HzD. 100Hz Cu 36:Mt mch chn sng ca mt my thu v tuyn gm mt cun cm c t cm L bin thin t 0,3H n 12H v mt t in c in dung bin thin t 20pF n 800pF. My ny c th bt c sng in t c bc sng ln nht l: A. 184,6m.B.284,6m.C. 540m.D. 640m. Cu 37:Trong mch in xoay chiu RLC khng phn nhnh. Nu tng tn s dng in th A. dung khng tng.B. lch pha ca in p so vi dng in tng. C. cng hiu dng gim.D. cm khng gim Cu 38:Chn cu sai. A. Mi nh sng n sc c mt bc sng v tn s xc nh. B.Chit sut ca cht lm lng knh i vi nh sng n sc c bc sng cng ngn th cng ln. C.Mi nh sng n sc c mt mu sc v tn s nht nh. D. Tc truyn ca cc nh n sc khc nhau trong cng mt mi trng th khc nhau. Cu 39:Chiu bc x c bc sng = 0,552um vi cng sut P = 1,2W vo catot ca mt t bo quang in, dng quang in bo ha c cng Ibh = 2mA. Tnh hiu sut lng t ca hin tng quang in.Cho h = 6,625.10-34Js ; c = 3.108m/s, e = 1,6.10-19C. Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 14 A.0,65%B.0,37%C.0,55%D.0,425% Cu 40:Ht nhn 210Pol cht phng x pht ra tia v bin i thnh ht nhn Pb. Ti thi im t, t l gia s ht nhn ch v s ht Po trong mu l 5, vy ti thi im ny t l khi lng ht ch v khi lng ht Po l A. 0,204.B.4,905C. 0,196.D.5,097. Cu 41:Khi lng ca ca Thin H ca chng ta vo c khong A. 200 t khi lng Mt Tri B. 20 t khi lng Mt TriD. 2000 t khi lng Mt TriC. 500 t khi lng Mt Tri Cu 42:Cho phn ng ht nhn: 73p Li 2 17, 3MeV + o + . Cho NA = 6,023.1023 mol-1. Khi to thnh c 1g Hli th nng lng ta ra t phn ng trn l A.13,02.1023MeV.B. 26,04.1023MeV.C. 8,68.1023MeV.D. 34,72.1023MeV. Cu 43:Ha t nha n teri 21D cokho i l ng 2,0136u. Bie t kho i l ng cua proton la1,0073u v,cu a ntron la1,008.7u. Na ng l ng lie n ke t cu a ha t nha n 12D la : A. 0,67MeVB. 1,86MeVC. 2,02MeVD. 2,23MeV* Cu 44:Mt con lc l xo dao ng iu ha theo phng thng ng. Thi gian vt i t v tr thp nht n v tr cao nht cch nhau 20 cm l 0,75 s. Gc thi gian c chn l lc vt ang chuyn ng chm dn theo chiu dng vi vn tc l 0, 23tm/s. Phng trnh dao ng ca vt l A. x = 10cos(43tt - 6t) cm B. x = 10cos(43tt - 3t) cm C. x = 10css(34tt + 3t) cmD. x = 10cos(34tt - 6t) cm Cu 45:Con lc l xo gm hn bi c m= 400 gv l xo c k= 80 N/m dao ng iu ha trn mt on thng di 10 cm. Tc ca hn bi khi qua v tr cn bng l A.1,41 m/s.B. 2,00 m/s.C. 0,25 m/s.D. 0,71 m/s Cu 46:Mt in tr thun R=100O, khi dng dng in c tn s 50Hz. Nu dng dng in c tn s 100Hz th in tr s A. Gim 2 ln B. Tng 2 lnC. Khng iD. Gim 1/2 ln Cu 47:Tm pht biu ng v tia o? A.Tia o l sng in t B. Tia o chuyn ng vi tc trong khng kh l 3.108 m/s C.Tia o b lch pha bn t in dng D. Tia o l dng ht nhn42He Cu 48:Iot13553 I l cht phng x c chu k bn r 8,9 ngy. Lc u c 5g. Khi lng Iot cn li l 1g sau thi gianA. t = 12,3 ngyB. t = 20,7 ngyC. 28,5 ngyD. 16,4 ngy Cu 49: on mch AB cha hai phn t trong ba phn t( R,L,C) nhng cha c xc nh. Bit rng biu thc dng in trong mch l i = 4cos( 100tt + t/3) A. V biu thc cng dng in trong mch l u = 200cos( 100tt + t/6). Hy xc nh hai phn t trn? Tnh cng sut trong mch? A. R v L; P = 4003 W B. R v C; P = 400W C. C v L; P = 4003 W D. R v C ; P = 2003 W Cu 50:Mt my pht in xoay chiu mt pha vi roto c hai cp cc pht ra dng in 50 Hz. Tm tc quay ca ca roto trong mi pht? A. 3000 vng/phtB. 2000 vng/phtC. 50 vng/phtD. 1500 vng/pht Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 15 P N 3 1C2C3C4B5C6B7A8A9A10B 11D12C13A14C15C16A17A18C19C20C 21A22C23B24D25D26D27C28B29D30B 31D32D33C34B35D36A37B38A39B40B 41A42B43D44A45A46C47D48B49D50D Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 16 GIO DC HNG PHC THI TH ( thi c 04trang) THI TH I HC 2011 Mn thi: VT L; Khi A Thi gian lm bi: 90 pht, khng k thi gian pht . Cu 1:Mt cun dy thun cm, c t cm L = t2H mc ni tip vi mt t in C = 31,8F u . Bit in pgia 2 u cun dy c dng u = 100cos (1006tt + t )(V). Biu thc in p gia 2 u t in l A. u = 50cos ( 10065tt t ) ( V)B. u = 50 cos ( 10065tt + t ) ( V) C. u=100 cos (1003tt t )(V) D. u=100 cos (1003tt + t )(V Cu 2:Chiu vo catt ca 1 t bo quang in nh sng n sc c = 0,42(um), trit tiu dng quang in ta phi tvomt in th hm 0,96(V). Cho h = 6,625.10-34 (J.s), c = 3.108 (m/s). Cng thotca kim loi ny l: (tnh gn ng nht) A. 2(eV) B. 1,2(eV)C. 2,96(eV) D. 1,5 (eV) Cu 3:Trong th i gian 4 chu k so ng truye n c qua ng ng la12m. Tre n phng truyen so ng, khoa ng gi a 2 ie m ga n nhau nha t dao o ng vuo ng pha la :A. 0,75mB. 1,5m C. 3mD. 2,25m Cu 4:Con lc l xo dao ng vi bin A. Thi gian ngn nht vt i t v tr cn bng n im M c li 22 Ax =l 0,25(s). Chu k ca con lc: A. 1(s)B. 1,5(s)C. 0,5(s)D. 2(s) Cu 5:Ht nhn 23892U ngyn phnr theo phng trnh 238 A92 ZU X o + . Bit ngnngcahtnhn con AZX l 83,8.10 MeV, ng nng ca hto l (ly khi lng cc ht nhn theo n v u bng khi s ca chng) A. 0,22MeVB. 2,22eVC. 4,42eVD. 27, 2.10 MeV Cu 6:Mtcon lc n khi lngmdao ng iuhovi bin gc o0. Biu thc tnh tcchuyn ng ca vt li o l: A. 2 2 20( ) v gl o o = B. 2 2 202 ( ) v gl o o = C. 2 2 20( ) v gl o o = + D. 2 2 202 (3 2 ) v gl o o = Cu 7:Con lc l xo dao ng theo phng thng ng, trong hai ln lin tip con lc qua v tr cn bng th A.Gia tc bng nhau, ng nng bng nhau.B. ng nng bng nhau, vn tc bng nhau. C. Gia tc bng nhau, vn tc bng nhau.D.Gia tc bng nhau, li khc nhau Cu 8:Ta c mt cun cm L v hai t C1 v C2. Khi mc L v C1 thnh mch dao ng th mch hot ng vi chu k 6s, nu mc L v C2 th chu k l 8 s. Vy khi mc L v C1 ni tip C2 thnh mch dao ng th mch c chu k dao ng lA. 10sB.4,8s C. 14s D. 3,14s Cu 9:Cho dng in c tn s f = 50Hz qua on mch RLC khng phnnhnh, dng Ot k o cng sut ca mch th thy cng sut c gi tr cc i. Tm in dung ca t in, bit t cm ca cun dy l L = 1/t (H) A. C ~ 3,14.10-5 F.B. C ~ 6,36.10-5 FC. C ~ 1,59.10-5 FD. C ~ 9,42.10-5 F Cu 10:My pht in xoay chiu c cng sut 1000(KW). Dng in do n pht ra sau khi tng th ln n 110(KV) c truyn i xa bng mt dy dn c in tr 20(O). Hiu sut truyn ti l: A. 90B. 98C. 97D. 99,8 THI S 4 Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 17 Cu 11:Chiu mt tia sng trng vo mt lng knh c gc chit quang A = 40 di gc ti hp. Bit chit sut ca lng knh i vi nh sng v tm ln lt l 1,62 v 1,68. rng gc quang ph ca tia sng saukhi l khi lng knh l A. 0,0150. B. 0,240C. 0,24 rad. D. 0,015 rad. Cu 12:Mo t l ng cha t pho ng xasau 10 nga y th l ngcha t pho ngxab pha n ra. Sau bao lau th kho i l ng cu a noco n 1/8 so v i ban a u?A. 5 nga yB. 10 nga yC. 15 nga y D. 20 nga y Cu 13:Hai l xo c cng l k1, k2 v mt vt nng m = 1kg. Khi mc hai l xo song song th to ra mt con lcdaongiuhovi1=10 5 rad/s,khimcnitiphailxothconlcdaongvi2= 2 30 rad/s. Gi tr ca k1, k2 l A. 100N/m, 200N/mB. 200N/m, 300N/m C. 100N/m, 400N/m D.200N/m,400N/m Cu 14:Nhn nh no sau y l sai khi ni v hin tng cng hng trong mt h c hc. A. Tn s dao ng ca h bng vi tn s ca ngoi lc. B.Khi c cng hng th dao ng ca h khng phi l iu ha. C.Bin dao ng ln khi lc cn mi trng nh. D. Khi c cng hng th dao ng ca h l dao ng iu ha. Cu 15:Mt vt dao ng iu ho theo phng trnh x = 10 sin (24tt + t ) cm. C nngca vt bin thin tun hon vi chu k A. 0,25 sB. 0,5 sC. khng bin thinD. 1 s Cu 16:HaidaongiuhocngphngcngtnscbinA1=8cm;A2=6cm.Bindaong tng hp c th nhn gi tr no sau y ? A. 48cm B.1cm C. 15cmD.8cm Cu 17:Mtchtimthamgiangthihaidaongiuhacngphngcphngtrnhlnltlx1 = 5sin(10t + t/6) v x2 = 5cos(10t). Phng trnh dao ng tng hp ca vt l A. x = 10sin(10t - t/6)B. x = 10sin(10t + t/3) C. x = 5 3 sin(10t - t/6) D. x = 5 3 sin(10t + t/3) Cu 18:Hai ngun sng c dao ng cng tn s, cng pha .Quan st hin tng giao thoa thy trn on AB c 5 im dao ng vi bin cc i (k c A v B). S im khng dao ng trn on AB l A. 4 imB. 2 imC. 5 im D. 6 im Cu 19:Khi c sng dng trn si dy n hi, 2 phn t vt cht ti 2 im bng gn nhau nht s dao ng:A. Ngc phaB. Cng pha.C. Lch phaD. Vung pha Cu 20:Mch dao ng bt tn hiu ca mt my thu v tuyn gm mt cun cm c h s t cm L = 2 u F v mt t in. my thu bt c sng v tuyn c bc sng = 16m th t in phi c in dung bng bao nhiu? A.36pF .B. 320pF.C. 17,5pF.D. 160pF Cu 21:Bit khong thi gian gia 2 ln lin tip nng lng in trng bng nng lng t trng ca mch dao ng in t t do LC l 710s. Tn s dao ng ring ca mch l: A. 2 MHzB. 5 MHz C. 2,5 MHzD. 10MHz Cu 22:in p gia hai u mt on mch RLC ni tip sm pha t/4 so vi cng dng in. Khi A. Tn s dng in trong on mch nh hn gi tr cn xy ra cng hng.B.Tng tr ca on mch bng hai ln in tr thun ca mch.C.Hiu s gia cm khng v dung khng bng in tr thun ca on mch. D. in p gia hai u in tr thun sm pha t/4 so vi in p gia hai bn t in. Cu 23:Mt on mch in xoay chiu gm mt t in c dung khng ZC = 200 v mt cun dy mc ni tip.Khitvohaiuonmchtrnmtinpxoaychiuluncbiuthcu=120 2 cos(100t+ 3t)V th thy in p gia hai u cun dy c gi tr hiudng l 120 v sm pha 2tso vi in p t vo mch. Cng sut tiu th ca cun dy l A. 72 W.B. 240W.C. 120W.D. 144W Cu 24:Mt my bin p c s vng dy ca cun s cp ln hn s vng dy ca cun th cp. Bin p ny c tc dng Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 18 A. tng cng dng in, gim in pB. gim cng dng in, tng in pC. tng cng dng in, tng in p D. gim cng dng in, gim in pCu 25:t in pu = 200 2cos 100tt (V) vo hai u t in C, th cng dng in qua mch c biu thc i = 2cos (100tt + m) (A). Tm m. A. m = 0.B. m = t.C. m = t/2D. m = - t/2 Cu 26:t vo hai u on mch RLC khng phn nhnhin pu = 100 2 cos 100tt (V) th dng in qua mch l i =2 cos 100tt (A). Tng tr thun ca on mch lA. R = 200O.B. R = 50O.C. R = 100O.D. R = 20O. Cu 27:Chiunhsngtrngcbcsngt0,38mn0,76mvohaikhecathnghimIng.Bit khong cch gia hai khe l 1mm, khong cch t hai khe ti mn l 3m. S bc x cho vn sng ti v tr vn ti th ba ca bc x c bc sng 0,5m l: A. 2 bc x.B. 1 bc x.C. 3 bc x.D. khng c bc x no. Cu 28:Tia hng ngoi v tia Rnghen c bc sng di ngn khc nhau nn chng A. C bn cht khc nhau v ng dng trong khoa hc k thut khc nhau. B.B lch khc nhau trong t trng u. C.B lch khc nhau trong in trng u. D. Chng u c bn cht ging nhau nhng tnh chtkhc nhau. Cu 29:TrongthnghimgiaothoanhsngIngdngnhsngcbcsngt0,4umn0,7um. Khong cch gia hai khe Ing l a = 2mm, khong cch t hai khe n mn quan st l D = 1,2m ti im M cch vn sng trung tm mt khong xM = 1,95 mm c my bc x cho vn sng A. c 8 bc xB. c 4 bc xC. c 3 bc xD. c 1 bc x Cu 30:Trong th nghim I-ng v giao thoa nh sng, cc khe hp c chiubi bc x bc sng 1 = 0,6 u m v sau thay bc x 1 bngbc x c bc sng 2 . Trn mn quan st ngi ta thy, ti v tr vn ti th 5 ca bc x 1trng vi v tr vn sng bc5 ca bc x 2 . 2c gi tr l: A. 0,57 u m.B. 0,60 u m.C. 0,67 u m.D. 0,54 u m. Cu 31:Trong th nghim vi t bo quang in, nu nh sng kch thch c bc sng nh hn gii hn quang in th cng dng quang in bo ho A. T l nghch vi cng chm sng kch thch. B.B. Khng ph thuc vo cng chm sng kch thch.C.T lthunvi cng chm sng kch thch. D. Tng t l thun vi bnh phng cng chm sng kch thch. Cu 32:on mch xoay chiu nh hnh v. RV , vn k (V1) ch 80(V), vn k (V2) ch 100(V) v vn k (V) ch 60(V). lch pha uAM vi uAB l: A. 37B. 53C. 90D. 45 Cu 33:Thn th con ngi nhit 370C pht ra bc x no trong cc bc x sau y? A. Bc x nhn thyB. Tia t ngoiC. Tia RnghenD. Tia hng ngoi Cu 34:Cc vch trong dy Laiman A. Thuc vng hng ngoi.B. Thuc vng nh sng nhn thy c. C. Thuc vng t ngoi. D. Mt phn nm trong vng nh sng nhn thy, mt phn nm trong vng t ngoi. Cu 35:Hie n tng quang ie n trong lahie n t ngA. B t electron ra kho i bema t kim loa i khi chie u va o kim loa i a nh sa ng cob c so ng thch h p.B. Electron b ba n ra kho i kim loa i khi kim loa i b o t no ng.C. Electron lien ket c giai phong thanh electron dan khi chat ban dan c chieu bang bc xa thch hpD. Hie n t ng ie n trcu a va t da n kim loa i tang le n khi chie u a nh sa ng va o kim loa i. Cu 36:Cho h = 6,625.10 34 (Js),c = 3.108 (m/s),e= 1,6.10 19 C. Cng thot electron ca nhm l 3,45 eV. xy ra hin tng quang in nht thit phi chiu vo b mt nhm nh sng c bc sng tha mnA. < 0,26 m u B. > 0,36 m uC. s 0,36 m u D. = 0,36 m uB CL A V1 V2 MV Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 19 Cu 37: ion ha nguyn t hiro, ngi ta cn mt nng lng l 13,6 eV. Bc sng ngn nht ca vch quang ph c th c c trong quang ph hiro l A. 91 nm. B.112nm. C. 0,91u m.D. 0,071u m.. Cu 38:Mtmucht phngxckhi lng 0m , chu k bn r bng 3,8 ngy.Sau11,2 ngykhi lng cht phng x cn li trong mu l 2,5g. Khi lng ban u 0mbng: A. 10gB. 12gC. 19,2gD. 25g Cu 39:Ht nhn 2411Naphn r |vi chu k bn r l 15 gi, to thnh ht nhn X. Sau thi gian bao lu mt mu cht phng x 2411Nanguyn cht lc u s c t s s nguyn t ca X v ca Na c trong mu bng 0,75? A. 12,1hB. 8,6hC. 24,2hD. 10,1h Cu 40:Sau khi c tch ra t ht nhnHe42, tng khi lng ca 2 prtn v 2 ntrn ln hnkhi lng ht nhn 4He mt lng l 0,0305u. Nu 1u = 9312cMeV, nng lng ng vi mi nucln, tch chng ra khi ht nhn 4He l bao nhiu? A. 7,098875MeV.B. 2,745.1015J.C. 28,3955MeV.D. 0.2745.1016MeV. Cu 41:Trong th nghim giao thoa sng trn mt nc hai ngun kt hp A, B dao ng cng pha vi tn s 10Hz. Tc truyn sng trnmt nc l 20cm/s. Hai im M, N trnmtnccMA=15cm,MB=20cm, NA=32cm, NB=24,5cm. S ng dao ng cc i gia M v N l: A. 4 ng.B. 7 ng.C. 5 ng.D. 6 ng. Cu 42:Trong dao ng iu ho , vn tc bin i iu ho A. cng pha so vi li .B.ngc pha so vi li .C. sm pha t/2 so vi li .D. tr pha t/2 so vi li . Cu 43:Chn cu ng . A.Nhng im cch nhau mt bc sng th dao ng cng pha. B.Nhngimnmtrnphngtruynsngvcchnhaumtsnguynlnbcsngthdaong cng pha.C.Nhng im cch nhau na bc sng th dao ng ngc pha. D.Nhng im cch nhau mt s nguynna bc sng th dao ng ngc pha Cu 44:Sng in t c p dng trong thng tin lin lc di nc thuc loi A. Sng di.B. Sng ngnC. Sng trung.D. Sng cc ngn. Cu 45:Mt my bin p l tng c t s vng dy cun s cp v th cp l 2:3. Cun th cp ni vi ti tiu th l mch in RLC khng phn nhnh c R=60O, 30, 6 3 10;12 3L HC Ft t= = , cun s cp ni vi in p xoay chiu c tr hiu dng 120V tn s 50Hz. Cng sut to nhit trn ti tiu th l:A. 180 WB. 90 WC. 135 WD. 26,7 W Cu 46:Mt mch in gm R,L,C mc ni tip. Cun cm c t cm L =t1 (H), t in c in dung C = t410 . 2(F). Chu kcadng inxoaychiu trongmch l 0,02s. Cng dng in trongmch lch pha 6t so viin hai u mch th in tr R c gi tr l A.3100OB. 100 3 O C. 50 3 O D. 350O Cu 47:Trong my pht in xoay chiu mt pha, gim tc quay ca r to ngi taA. gim s cun dy v tng s cp cc.B. tng s cun dy v tng s cp cc. C. gim s cun dy v gim s cp cc. D. tng s cun dy v gim s cp cc. Cu 48:Gi thit no khng ng v cc ht quac ?A. Mi ht quac u c in tch l phn s ca in tch nguyn t. B. Mi ht quac u c in tch l bi s nguyn ca in tch nguyn t.C. C 6 ht quac cng vi 6 i quac (phn quac) tng ng. D. Mi harn u to bi mt s ht quac. Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 20 Cu 49:HtPlni(A=210,Z=84)ngynphngxhto tothnhchPb.Hto sinhracng nng Ko=61,8MeV. Nng lng to ra trong phn ng l A. 63MeV B. 66MeVC. 68MeVD. 72MeV Cu 50:S nguyn t N0 c trong m0=200g cht It phng xI13153 l A. N0=9,19.1021; B. N0=9,19.10 23; C. N0=9,19.1024; D. N0=9,19.1022 P N 4 1A2A3A4D5B6A7A8B9A10D 11B12C13B14B15C16D17D18A19A20A 21C22C23A24A25C26C27A28D29B30D 31C32C33D34C35C36C37A38C39A40A 41D42C43B44A45C46C47B48B49A50B Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 21 GIO DC HNG PHC THI TH ( thi c 04 trang) THI TH I HC 2011 Mn thi: VT L; Khi A Thi gian lm bi: 90 pht, khng k thi gian pht . Cu 1:Mt vt dao ng iu ha c phng trnh x = 5cos(4t t +t /3) (cm,s). tnh tc trung bnh ca vt trong khong thi gian tnh t lc bt u kho st dao ng n thi im vt i qua v tr cn bng theo chiu dng ln th nht. A. 25,71 cm/s. B. 42,86 cm/s. C. 6 cm/s D. 8,57 cm/s. Cu 2: to ca m thanh c c trng bng A. Cng m. B. Mc p sut m thanh.C. Mc cng m thanh.D. Bin dao ng ca m thanh Cu 3:Trongmch thu sngv tuynngi ta iu chnh indungcatC = 1/4000t(F)vtcm ca cun dy L = 1,6/t (H). Khi sng thu c c tn s bao nhiu? Ly t2 = 10. A. 200Hz.B. 100Hz.C. 50Hz.D. 25Hz. Cu 4:Cho on mch RLC ni tip, trong cun dy thun cm L = 1/t (H); t in c in dung C = 16 uF v tr thun R. t in p xoay chiu tn s50Hz vo hai u on mch. Gi tr ca R cng sut ca mch t cc i lA. R = 100 2 O B. R = 100 OC. R = 200O D. R = 200 2OCu 5:TrongmtthnghimgiaothoaIng,khongcchgiahaikheIngl1,5mm,khongcchthai khenmnnhl2m.Sdngngthihaibcxnsccbcsng1=0,48umv2=0,64um. Khong cch ngn nht gia hai vn sng cng mu vi vn trung tm lA. 0,96mmB. 1,28mm C. 2,32mm D. 2,56mm Cu 6:Gi i ha n quang ie n cu a kim loa i la0,565 u m. Co ng thoa t cu a nolaA. 2,2JB. 3,52eVC. -3,52.10-19JD. 3,52.10-19J Cu 7:Sau 2 gi, phng x ca mt mu cht phng x gim 4 ln. Chu k bn r ca cht phng x lA.2 giB. 3 gi.C. 1 gi.D.1,5 gi. Cu 8:Sau 24 gi s nguyn t Radon gim i 18,2% (do phng x) so vi s nguyn t ban u. Hng s phng x ca Radon l A. = 2,325.10-6(s-1)B. = 2,315.10-5(s-1) C. = 1,975.10-5(s-1)D. = 1,975.10-6(s-1) Cu 9:Mt pion trung ha phn r thnh 2 tiagamma:0 + . Bc sng ca cc tia gamma c pht ra trong phnr ca pion ng yn l A. h/(mc2)B. h/(mc)C. 2h/(mc2)D. 2h/(mc) Cu 10:Mt vt dao ng iu ha vi chu k T = 3,14s. Pha dao ng ca vt khi n qua v trx = 2cm vi vn tc v = 0,04m/sl A. 3t radB. 4t radC. 6t radD. -t4

Cu 11:Mt con lc l xo dao ng iu ha theo phng thng ng, ti ni c gia tc ri t do bng g. v tr cn bng l xo gin ra mt onl A . Tn s dao ng ca con lc c xc nh theo cng thc: A.2lgtAB. 12lg tAC. 12gl t AD.2gltA Cu 12:Dao ng tng hp ca hai dao ng: 1x 5 2 cos t4t | |= |\ .(cm) v 2x 10cos t2t | |= + |\ .(cm) c phng trnh: A.x 15 2 cos t4t | |= + |\ .(cm)B.x 10 2 cos t4t | |= |\ .(cm) THI S 5 Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 22 C.x 15 2 cos t2t | |= + |\ .(cm) D.x 5 2 cos t4t | |= + |\ .(cm) Cu 13:Hai ngun sng kt hp l hai ngun sng A. c cng tn s v lch pha khng i theo thi gian. B. c cng tn s, bin v lch pha khng i theo thi gian. C. c cng tn s v bin . D. c cng bin v lch pha khng i theo thi gian. Cu 14:Thc hin giao thoa sng c hc trn mt cht lng. Hai ngun kt hp A,B ging nhau, t cch nhau 4 cm, bc sng l 8 mm. S im dao ng cc i trn on AB lA. 15 B. 9C. 13D. 11 Cu 15:Biu thc sng ca im M trn dy n hi c dng u = Acos2t (2t-20x) cm.Trong x tnh bng cm, t tnh bng giy.Trong khong thi gian 2s sng truyn c qung ng l: A. 20cm B. 40cm.C. 80cmD. 60cm Cu 16:S hnh thnh dao ng in t t do trong mch dao ng l do hin tng A. Cm ng in t.B. Cng hng in.C. T cm.D. T ha. Cu 17:T in ca mt mch dao ng l mt t in phng. Khi khong cch gia cc bn t tng ln gp i th tn s dao ng trong mch A. Tng gp i.B. Tng2ln.C. Gim2ln.D. Gim 2 ln. Cu 18:Mt cun dy c 200 vng, din tch mi vng 300 cm2, c t trong mt t trng u, cm ng t 0,015 T. Cun dy c th quay quanh mt trc i xng ca n, vung gc vi t trng th sut in ng cc i xut hin trong cun dy l 7,1 V. Tc gc l A. 78 rad/s B. 79 rad/s C. 80 rad/s D. 77 rad/s Cu 19:Cho mch in nh hnh v 050 3 R = O,50L CZ Z = = O AMUv MBU lch pha 750. in tr R c gi tr l A.25 3OB. 50OC. 25OD. 50 3O Cu 20:Vo cng mt thi imno , hai dng in i1 = I0 cos (t + 1) vi2 = I0 cos (t + 2) u c cng gi tr tc thi 0,5I0 nhng mt dng in ang gim, cn mt dng in ang tng. Hai dng in ny lch pha nhau mt gc A. t / 6 B. 2t / 3 C. 5t / 6 D. 4t / 3 Cu 21:TrongthnghimI-ngvgiaothoanhsng,cckhehpcchiubibcxbcsng 1 = 0,6 u m v sau thay bc x 1 bngbc x c bc sng 2 . Trn mn quan st ngi ta thy, ti v tr vn ti th 5 ca bc x 1trng vi v tr vn sng bc5 ca bc x 2 . 2c gi tr l A. 0,57 u m.B. 0,60 u m.C. 0,67 u m.D. 0,54 u m. Cu 22:Khe sng ca ng chun trc ca my quang ph c t ti A. quang tm ca thu knh hi t B. tiu im nh ca thu knh hi t C. ti mt im trn trc chnh ca thu knh hi t D. tiu im vt ca thu knh hi t Cu 23:. Trong th nghim giao thoa nh sng n sc ca Ing khong vn giao thoa l i, nu a ton b th nghim vo trong cht lng trong sut c chit sut n th khong vn s l A. i/(n+1)B. niC. i/nD. i/(n-1) Cu 24:Cng thot electron ca mt kim loi l 2,4 eV. Nu chiu ng thi hai bc x c tn s f1 = 1015 Hz v f2 = 1,5.101 5 Hz vo tm kim loi t c lp th in th ln nht ca tm kim l: ( cho h= 6,625.10 34 Js; c= 3.108 m/s; |e|= 1,6.10 19 C )A.1,74 V. B. 3,81 V.C. 5,55 V.D. 2,78 V. Cu 25:Pht biu no sau y sai ?A.Nutimtnicmtttrngbinthintheothigianthtinixuthinmtintrng xoy.B L, R0 RC MA Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 23 B. Nu ti mt ni c mt in trng khng u th ti ni xut hin mt t trng xoy C.intrngvttrnglhaimtthhinkhcnhaucamtloitrngduynhtgilint trng.D. in t trng xut hin xung quanh mt ch c tia la in . Cu 26:Ht nhn 23688Ra phng ra 3 ht v mt ht - trong chui phng x lin tip. Khi ht nhn con to thnh l: A.22284X.B.22483X.C. 22283X.D. 22484X. Cu 27:Vnh ai tiu hnh tinh nm gia cp hnh tinh no trong cc cp hnh tinhsau A. Sao Ha v Tri tB. Sao Ha v Sao Mc C. Sao Mc vSao Th D. Sao Kim v Tri t Cu 28:Mt vt dao ng iu ha vi tn s bng 5Hz. Thi gian ngn nht vt i t v tr c li x1 = - 0,5A n v tr c li x2 = + 0,5A l A.1/10 s.B.1/20 s.C.1/30 s.D.1 s. Cu 29:Tronghintngtruynsngcvitctruynsngl80cm/s,tnsdaongcmtgitr thucon10Hzn12,5Hz.Haiimtrnphngtruynsngcchnhau25cmlundaongvungpha. Bcsng l A. 8 cmB. 6 cmC. 7,69 cmD. 7,25 cm Cu 30:Bit khong thi gian gia 2 ln lin tip nng lng in trng bng nng lng t trng ca mch dao ng in t t do LC l 710s. Tn s dao ng ring ca mch l: A. 2 MHzB. 5 MHz C. 2,5 MHzD. 10MHz Cu 31:GiaothoakheI-ngvinhsngtrngcbcsngbinthint4.10-7mn7,6.10-7m.Haikhe cch nhau a=1mm v cch mn 1m. Ti v tr vn ti th 7 ca bc x c bc sng 0,693m cn c bao nhiu bc x khc cho vn sng ti ? A. 6B. 11C. 5D. 8 Cu 32:Cho dng in c tn s f = 50Hz qua on mch RLC khng phn nhnh, dng Ot k o cng sut ca mch th thy cng sut c gi tr cc i. Tm in dung ca t in, bit t cm ca cun dy l L = 1/t (H) A. C ~ 3,14.10-5 F.B. C ~ 6,36.10-5 FC. C ~ 1,59.10-5 FD. C ~ 9,42.10-5 F Cu 33:Khi ga nquana ngm1 va o loxo, nodaoo ng ieuho a v ichu kyT1= 1,2s.khi ga nquana ng m2 va o loxo tre n,nodao o ng chu ky1,6s. khi ga n o ng th i hai va t m1 vam2 th chu kydao o ng cu a chu ng la A. 1,4sB. 2,0sC. 2,8sD. 4,0s Cu 34:Dng in xoay chiu l dng in c A. Cng bin thin tun hon theo thi gian. B. Chiu bin thin tun hon theo thi gian. C. Chiu bin thin iu ho theo thi gian. D. Cng bin thin iu ho theo thi gian. Cu 35:Trong vic truyn ti in nng i xa, bin php gim hao ph trn ng dy ti in l: A. tng chiu di ca dy B. gim tit din ca dy C. tngin p ni truyn iD. chn dy c in tr sutCu 36:a i l ng na o cu a cha t pho ng xa kho ng bie n thie n cu ng quy lua t v i ca c ai l ng con lai ne u sau a y A.soha t nha n pho ng xaco n la i.B. somol cha t pho ng xaco n la i. C. kho i l ng cu a l ng cha t co n la i.D. ha ng sopho ng xacu a l ng cha t co n la i. Cu 37:Trong nguyn t hir, electron ang qu o dng M c th bc x ra phtn thuc A. 1 vch trong dy Laiman.B. 1 vch trong dy Laiman v 1 vch trong dy Banme. C. 2 vch trong dy Laiman v 1 vch trong dy Banme. D. 1 vch trong dy Banme. Cu 38:Chiu bcxc bc sng = 0,4um vo catot ca mt t bo quang in.Cngthot electronca kim loi lm catot l A = 2eV. Cho h = 6,625.10-34Js v c = 3.108m/s. 1eV = 1,6.10-19J.Gi trin p t vo hai u anot v catot trit tiu dng quang in l A.UAK s - 1,1V.B.UAK s - 1,2V.C.UAK s - 1,4V.D.UAK s 1,5V. Cu 39:Mt sng c hc lan truyn trong mt mi trng vi phng trnh Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 24 3sin( )6 24 6t du cmt t t= + . Trong d tnh bng mt(m), t tnh bng giy(s). Vn tc truyn sng l: A. 400 cm/s.B. 4 cm/s.C. 5 m/s.D. 5 cm/s. Cu 40:Mt mch dao ng LC l tng gm cun thun cm L v hai t C ging nhau mc ni tip. Mch ang hot ng th ngay ti thi im nng lng in trng v nng lng t trng trong mch bng nhau, mt t b nh thng hon ton. Dng in cc i trong mch sau s bng bao nhiu ln so vi lc u ? A. khng i B. 14 C. 0,5 3D. 12

Cu 41:Cunthcpcamtmy bin thc 1000vng. T thngxoaychiutrong li bin thc tn s 50Hz v gi tr cc i l 0,5mWb. Sut in nghiu dng ca cun s cp l: A. 500VB. 157VC. 111VD. 353,6V Cu 42:Khi mt ht nhn nguyn t phng x ln lt mt tia o ri mt tia |- th ht nhn nguyn t s bin i A. s prtn gim 4, s ntrn gim 1B. s prtn gim 1, s ntrn gim 3 C. s prtn gim 1, s ntrn gim 4D. s prtn gim 3, s ntrn gim 1 Cu 43:Treomtvtnngvomtlxo, l xodn 10cm, lyg = 10m/s2.Kch thchchovt dao ngvi bin nh th chu k dao ng ca vt l A. 0,63sB. 0,87sC.1,28sD. 2,12s Cu 44:Mt vt treo vo l xo lm n gin ra 4cm. Ly 2 = 10, cho g = 10m/s2. Tn s dao ng ca vt lA. 2,5Hz. B. 5,0HzC. 4,5Hz. D. 2,0Hz. Cu 45:Mchxoaychiukhngphnnhnhcinphaiuonmchlu=200 2 sin100tt(V), gm R = 100O; L = 1t H; C = 10-4 t F tiu th cng sutA. 200W. B. 400W.C. 100W.D. 50W. Cu 46:t in p xoay chiu c tr hiu dng U = 120 V tn s f = 60 Hz vo hai u mt bng n hunh quang. Bit n ch sng ln khi in p t vo n khng nh hn 602V. T s thi gian n sng v n tt trong 30 pht lA. 3 ln.B. 1/3 ln. C. 2 ln D. 0,5 ln. Cu 47:Chit sut ca mt mi trng ph thuc voA. Cng nh sngB. Bc sng nh sng C. Nng lng nh sng D. Tn s ca nh sng Cu 48:S xut hin cu vng sau cn mado hin tng no to nn? A. Hin tng tn sc nh sng.B. Hin tng khc x nh sng. C. Hin tng phn x nh sng.D. Hin tng giao thoa nh sng. Cu 49:C 2 mu cht phng x A & B thuc cng 1 cht c chu k bn r 138,2 ngy & c s lng ht nhn ban u nh nhau. Ti thi im quan st , t s phng x ca 2mu l BAHH=2,72. Tui ca mu A nhiu hn mu B lA. 199,5 ngy B. 199,8 ngyC. 190,4 ngy D. 189,8 ngy Cu 50:Mt vt thc hin ng thi hai dao ng cng phng c phng trnh : 14 3 os10 t(cm) x c t =v 24sin10 t(cm) x t = . Nhn nh no sau y l khng ng? A.Khi 14 3 x = cm th 20 x = .B.Khi 24 x = cm th 14 3 x = cm. C.Khi 14 3 x = cm th 20 x = .D.Khi 10 x = th 24 x = cm. Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 25 P N 5 1B2C3D4B5D6D7C8A9D10D 11C12D13A14D15A16C17B18B19B20B 21D22D23C24B25B26B27B28C29C30C 31A32A33B34D35C36D37C38A39A40A 41C42B43A44A45B46C47D48A49A50B Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 26 CLA NR BM GIO DC HNG PHC THI TH ( thi c 04 trang) THI TH I HC 2011 Mn thi: VT L; Khi A Thi gian lm bi: 90 pht, khng k thi gian pht . Cu 1: Mt vt DH trn trc Ox, khi vt i tim M c x1= A/2 theo chiu m n im N c li x2 = - A/2 ln th nht mt 1/30s. Tn s dao ng ca vt lA. 5Hz B. 10HzC. 5t Hz D. 10t Hz Cu 2:Hai l xo L1 v L2ccng di. Khi treovtmvo lxo L1 thchukdao ngca vt l T1= 0,3s, khi treo vt vo l xo L2 th chu k dao ng ca vt l 0,4s. Ni hai l xo vi nhau c hai u c mt l xo cng di ri treo vt vo h hai l xo th chu k dao ng ca vt l A. 0,5sB. 0,24sC. 0,36sD. 0,48s Cu 3:Mt ngun sng ti O c phng trnh u0 = acos(10t t) truyn theo phng Ox n im M cch O mt on x c phng trnhu = acos (10 t - 4x), x(m). Vn tc truyn sng lA. 9,14m/s B. 8,85m/s C. 7,85m/s D. 7,14m/s Cu 4:Khi ni v qu trnh sng in t, iu no sau y l khng ng? A. Trong qu trnh lan truyn, n mang theo nng lng. B.Vct cng in trng v vct cm ng t lun vung gc vi phng truyn sng. C.Trong qu trnh truyn sng, in trng v t trng lun dao ng vung pha nhau. D. Trong chn khng, bc sng ca sng in t t l nghch vi tn s sng. Cu 5:Mt on mch gm cun dy c in tr thun 100 3O, c t cm L ni tip vi t in c in dung 0,00005/t (F). t vo hai u on mch mt in p xoay chiu u = U0cos(100tt - t/4) (V) th biu thc cng dng in qua mch i =2 cos(100tt - t/12) (A). Ga tr ca L l A. L = 0,4/t (H)B. L = 0,6/t (H)C. L = 1/t (H) D. L = 0,5/t (H)Cu 6:Cho on mch nh hnh v. Khi t vo hai u mch mt in p c biu thc u = 120 2 cos100 tt(V) th thy in p gia hai u on NB vinpgiauonANccngmtgitrhiudngvtrongmch ang c cng hng in. in p hiu dng gia hai u in tr R l A. 30 2 V.B.60 2 V.C.30V.D.60VCu 7:Chn cu ng A. Tia X do cc vt b nung nng nhit cao pht ra B. Tia X c th pht ra t cc n in C. Tia X l sng in t c bc sng nh hn bc sng ca tia t ngoi D. Tia X c th xuyn qua tt c mi vt Cu 8:Bc x t ngoi l bc x in t A. C bc sng nh hn bc sng ca tia xB. C tn s thp hn so vi bc x hng ngoi C. C tn s ln hn so vi nh sng nhn thyD. C bc sng ln hn bc sng ca bc x tm Cu 9:Giihn quang inca Na tri l0,5m ucng thot ca km ln hn ca natri l 1,4 ln. Gii hn quang in ca kmlA. 0,7 u mB. 0,36 u m C. 0,9 m u . D. 0,3 u m. Cu 10:Mt cht phng x c chu k bn r l T. Sau 1 thi gian = A1tk t lc u, s phn trm nguyn t phng x cn li l: A. 36,8B. 73,6C. 63,8D. 26,4 Cu 11:Trong qu trnh dao ng iu ha ca con lc n. Nhn nh no sau y l sai? A. Khi qu nng im gii hn, lc cng dy treo c c ln nh hn trng lng ca vt . B. ln ca lc cng dy treo con lc lun ln hn trng lng vt. C.Chu k dao ng ca con lc khng ph thuc vo bin dao ng ca n. D. Khi khi gc hp bi phng dy treo con lc v phng thng ng gim, tc ca qu nng s tng THI S 6 Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 27 Cu 12:Hiuchiu di dy treo ca hai con lc n l 28(cm). Trong cng thi gian, con lc th nht c 6 dao ng, con lc th hai lm c 8 dao ng. Chiu di dy treo ca chng l: A. l1 = 64(cm), l2 = 36(cm)B. l1 = 36(cm), l2 = 64(cm) C. l1 = 24(cm), l2 = 52(cm)D. l1 = 52(cm), l2 = 24(cm) Cu 13:Hai ngun sng ging nhau ti A v B cch nhau 47cm trn mt nc, ch xt ring mt ngun th n lan truyn trn mt nc m khong cch gia hai ngn sng lin tip l 3cm, khi hai sng trn giao thoa nhau th trn on AB c s im khng dao ng l A: 32 B: 30 C. 16D. 15 Cu 14:in tch ca t in trong mch dao ng LC bin thin theo phng trnh q = Qocos(2Ttt + t ). Ti thi im t = 4T, ta c: A. Nng lng in trng cc i.B.Hiu in th gia hai bn t bng 0. C.in tch ca t cc i.D.Dng in qua cun dy bng 0. Cu 15:Tm pht biu ng khi ni v ng c khng ng b 3 pha: A. Rto l b phn to ra t trng quay.B. Stato gm hai cun dy t lch nhau mt gc 90o. C. ng c khng ng b 3 pha c s dng rng ri trong cc dng c gia nh. D. Tc gc ca rto nh hn tc gc ca t trng quay. Cu 16:onmchxoaychiunhhnhv, t=2L (H);C=31,8(uF);Rcgitrxcnh, i 2cos 100 t3t | |= t |\ .(A). Biu thc uMB c dng: A. MBu 200cos 100 t3t | |= t |\ .(V)B. MBu 600cos 100 t6t | |= t + |\ .(V) C. MBu 200cos 100 t6t | |= t + |\ .(V)D. MBu 600cos 100 t2t | |= t |\ .(V) Cu 17:Dng nh sng c bc sng 4.10 7 m n 7,5.10 7 m trong th nghim Y-ng v giao thoa nh sng. Bit khong cch gia hai khe l 0,6mm, khong cch gia hai khe v mn l 1,2m. Trong cc bc x trn, bc x no cho vn sng ti v tr trn mn cch vn sng trung tm 3,6mm ? A. 0,5 m B. 0,45 mC. 0,55 mD. 0,66 m Cu 18:Chiu bc x c bc sng = 0,552um vi cng sut P = 1,2W vo catot ca mt t bo quang in, dng quang in bo ha c cng Ibh = 2mA. Tnh hiu sut lng t ca hin tng quang in.Cho h = 6,625.10-34Js ; c = 3.108m/s, e = 1,6.10-19C. A.0,65%B.0,37%C.0,55%D.0,425% Cu 19:Mt qu cu bng kim loi c gii hn quang in l 0,277m c t c lp vi cc vt khc . Chiu vo qu cu nh sng n sc c 12,5Hz.B: fs 12,5Hz C. f< 12,5HzD. f < 25Hz Cu 11Ngi ta truyn ti dng in xoay chiu mt pha t nh my in n ni tiu th. Khi in p nh my in l 6kV th hiu sut truyn ti l 73%. hiu sut truyn ti l 97% th in p nh my in l A. 18kVB. 2kVC. 54kVD. p n khc Cu 12Mchgmcuncmvtincindungthayicmcnitiprimcvongunxoay chiuu=100 2 cos e t(V),e khngi.iuchnhindungmchcnghng,lcnyhiuinth hiu dng 2 u cun cm Bng 200(V).khi hiu in th hiu dng gia 2 Bn t l: A. 100 3 (V)B. 200(V) C. 100(V)D. 100 2 (V) Cu 13Trong cc n v sau y, n v no l n v ca cng dng in A..W . b s O .B. .WsbO.C. .WbsO.D. W.bs O. Cu 14MilinhgiainpphaUpvinpdyUdtrongcchmchnhsaomyphtinxoay chiu ba pha. A. Ud=3Up.B. Up= 3 UD.C. Ud=Up.D. Ud= 3 Up. Cu 15Trong mch in xoay chiu RLC khng phn nhnh. Nu tng tn s dng in th A. cm khng gim.B. lch pha ca in p so vi dng in tng. C. cng hiu dng gim.D. dung khng tng. Cu 16.Chn cu sai.A. Cc kh hay hi p sut thp khi B kch thch pht sng s Bc x quang ph vch pht x.B. Quang ph khng ph thuc vo trng thi tn ti ca cc cht.C. Quang ph vch pht x l quang ph gm nhng vch mu ring r nm trn mt nn ti. D. Quang ph vch ca cc nguyn t ho hc khc nhau l khng ging nhau. Cu 17Trong th nghim Yng, ngi ta chiu sng 2 khe ng thi Bc x mu c Bc sng 640 nm v Bc x mu lc. Trn mn quan st, ngi ta thy gia hai vn sng cng mu vi vn sng chnh gia c 7 vn mu lc.Bc sng nh sng mu lc trong th nghim l: A. 540nm B. 580nmC. 500nm D. 560nm Cu 18Nng lngc ca photon nh sng c Bc snglA.c = ch.B. chc = . C. chc= D. hcc = . Cu 19Cho ht proton Bn ph ht nhn Li, sau phn ng ta thu c hai ht. Cho Bit mp = 1,0073u; mo = 4,0015u. v mLi = 7,0144u. Phn ng ny ta hay thu nng lng Bao nhiu? A. Phn ng ta nng lng 15MeV.B. Phn ng thu nng lng 17,41MeV. C. Phn ng thu nng lng 15MeV.D. A. Phn ng ta nng lng 17,41MeV. Cu 20Chu k Bn r ca Plni (P210)l 138 ngy m c phng x Ban u l 1,67.1014Bq (NA=6,022.1023 ht/mol). Khi lng Ban u ca Plni l: A.1g.B.1mg.C.1,5g.D.1,4g Cu 21Tm pht Biu sai v phn ng nhit hch: A. S kt hp hai ht nhn rt nh thnh mt ht nhn nng hn v ta ra nng lng B. Mi phn ng kt hp ta ra nng lng B hn mt phn ng phn hch, nhng tnh theo cng khi lng nhin liu th phn ng kt hp ta ra nng lng nhiu hn C. Phnngkt hp ta ranng lng nhiu, lmnngmitrng xung quanh nn t gi l phnng nhit hch D. Con ngi thc hin c phn ng nhit hch nhng di dng khng kim sot c l s n ca Bom H Cu 22Trn dyAB di 2m csng dngc haiBng sng,uA ni vi ngun dao ng(coi l mt nt sng), u B c nh. Tm tn s dao ng ca ngun, Bit vn tc sng trn dy l 200m/s. A. 50HzB. 25Hz C. 200HzD. 100Hz Cu 23Pht Biu no di y sai ? A. Dao ng tt dn l dao ng c bin gim dn theo thi gianB. Dao ng cng bc c tn s bng tn s ca ngoi lcC. Dao ng duy tr c tn s ph thuc vo nng lng cung cp cho h dao ng D. Cng hng c bin ph thuc vo lc cn ca mi trng Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 33 Cu 24Trong th nghim v sng dng trn mt si dy n hi di 1,2m vi hai uc nh, ngi ta quan st thy ngoi 2 u dy c nh cn c hai im khc trn dy khng dao ng. Bit khong thi gian gia hai ln lin tip si dy dui thng l 0,05s. Tc truyn sng trn dy l A. 12 m/s.B. 8 m/s.C. 16 m/s.D. 4 m/s. Cu 25 cao ca m ph thuc yu t no sau y? A. th dao ng ca ngun m.B. n hi ca ngun m. C. Bin dao ng ca ngun m.D. Tn s ca ngun m Cu 26in p gia 2 Bn t c Biu thc: 0u U cos 100 t3t | |= t |\ .. Xc nh thi im m cng dng in qua t in Bng khng: A. 1 k300 100+ (s) vi k e NB. 1 k300 50+(s) vi k e N C. 1 k300 100+ (s) vi k e ZD. 1 k300 50+ (s) vi k e Z Cu 27t hiu in th u=Uocos(t) (Uo v khng i) vo hai u on mch RLC khng phn nhnh. Bit in tr thun ca mch khng i. Khi c hin tng cng hng in trong on mch, pht Biu no sau y sai?A. Hiu in th hiu dng hai u on mch ln hn hiu in th gia hai u in tr R.B. Cng hiu dng ca dng in trong mch t gi tr ln nht.C. Cm khng v dung khng ca on mch Bng nhau.D. Hiu in th tc thi hai u on mch cng pha vi hiu in th tc thi hai u in trCu 28Chn cu saikhi ni v tia hng ngoiA. C th ngi c th pht ra tia hng ngoiB. Tia hng ngoi c tn s nh hn tn s ca nh sng C. Tia hng ngoi c mu hng D. Tia hng ngoi c dng sy kh mt s nng sn Cu 29on mch AB cha hai phn t trong ba phn t( R,L,C) nhng cha c xc nh. Bit rng biu thc dng in trong mch l i = 4cos( 100tt - t/6) A. V biu thc cng dng in trong mch l u = 200cos( 100tt + t/6). Hy xc nh hai phn t trn v tnh gi tr ca chng? A. R = 253 ; Z L = 25 B. R = 25 ; Z L = 253 C. R = 50 ; Z L = 503 D. R = 503 ; Z L = 50 Cu 30on mch AB gm hai phn t X v Ymc ni tip( X v Y ch cha mt phn t). Trong U X = 50 V, U Y = 20 V v gi tr hiu in th U AB = 30 V. vy phn t X,Y c th l g? A. R v CB. R v LC. L v CD. Khng c p nCu 31Biu thc dng in trong mch c dng i = 4cos( 8tt + t/6)A, vo thi im t dng in bng 0,7A. hi sau 3s dng in c gi tr l bao nhiu? A. - 0,7AB. 0,7AC. 0,5AD. 0,75A Cu 32MchRLCmcnitipcmcvomnginxoaychiuctnskhngi.Nucundy khng c in tr th h s cng sut cc i khi no?A. R = Z L - Z C B. R = Z L C. R = Z C D. Z L = Z C

Cu 33 Mch RLC c R thay i c c mc vo mng in xoay chiu c tn s khng i. R bng bao nhiu th mch t cng sut cc i?( Khng c hin tng cng hng xy ra). A. R = | | Z L - Z CB. R = 2Z CC. Z L = RD. Z C = RCu 34Mch in ch c R = 20 , Hiu in th hai u mch in l 40 V, tm cng sut trong mch khi . A. 40 WB. 60WC. 80WD. 0W Cu 35 Mch in ch c C, C = 10-4 /tF, tn s ca dng in trong mch 50 Hz, hiu in th hiu dng l 50 V. Tm cng sut trong mch khi . A. 40 WB. 60WC. 80WD. 0W Cu 36 Mch RLC mc ni tip, c R v C c th iu chnh c. Trong L = 1/ 2tH. c mc vo mng in 150 V - 50 Hz. Ta phi iu chnh Z C n gi tr no khi iu chnh R th gi tr ca U R khng thay i? A. 200 B. 50 C. 100 D. 150 Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 34 Cu 37MchRLCmcnitip,trongR=60,cuncmthunctcmLthayivtcC =10-3 /8tF. Hai u mch in mc vo ngun in xoay chiu c U khng iv bng 100 V v f = 50 Hz. iu chnh L hiu in th hai u cun dy ch cc i, tm gi tr L khi ? A. L =t1,25 HB.L = 12,5t HC. L =1,25t HD. L = 125t H Cu 38Mt c im ca s pht quang l A. mi vt khi kch thch n mt nhit thch hp th s pht quang. B. Quang ph ca vt pht quang ph thuc vo nh sng kch thch. C. Quang ph ca vt pht quang l quang ph lin tC. D. Bc x pht quang l Bc x ring ca vt. Cu 39Khi ni v my bin p, biu thc no sau y ng? A. i 1/i 2 = N 1/ N 2 B. i 1/i 2 = N 2/ N 1 C. N 1/ N 2 = U 1/U 2 D. . i 1/i 2 = U 2/U 1 Cu 40Trong qu trnh truyn ti in gim hao ph trn ng dy truyn ti xung 100 ln th cn tng hiu in th ln bao nhiu ln? A. 100 lnB. 10 ln C. 20 ln D. Khng c p n. Cu 41Mt nh my cn truyn i mt cng sut 1MW vi hiu in th l 500KV v h s cng sut ng truyn l 0,8. Hi in tr ca dy ln nht lbao nhiu cng sut truyn ti l 98% A. 32 B. 32000 C. 320 D. 3200 Cu 42Mtcon lc lxo tnmnganggmvtmv lxo ccngk=100N/m. Kch thch vtdao ng iu ho vi ng nng cc i 0,5J. Bin dao ng ca vt l A. 50 cmB. 1cmC. 10 cmD. 5cm Cu 43Mt si dy n hi 2 u c nh. Sng dng trn dy c Bc sng di nht l L. Chiu di ca dy l:A. L/2B. 2LC. LD. 4L Cu 44Chn cu sai khi ni v tnh cht v ng dng ca cc loi quang ph A.Da vo quang ph vch hp th v vch pht x ta Bit c thnh phn cu to ngun sng. B.Mi nguyn t ho hc c c trng Bi mt quang ph vch pht x v mt quang ph vch hp th. C.Da vo quang ph lin tc ta Bit c nhit ngun sng. D. Da vo quang ph lin tc ta c th pht hin c thnh phn ca ngun sng Cu 45Con lc l xo dao ng iu ha theo phng thng ng, ly gc ta ti VTCB, chiu dng ca trc ta hng xung di . th no sau y Biu din ng s thay i ca lc n hi T ca l xo theo li x ca vt Cu 46Trong da y pha n ra235 20792 82X Y coBao nhie u ha t, o |- c pha t ra? A.3 , 7 o | B.4 , 7 o | C.4 , 8 o | D.7 , 4 o |Cu 47Trong onmch RLC khng phn nhnh, lch pha gia hai u cun dy v hai u tr thun R khng th Bng A. t/6B. 3t/4C. t/4D. t/12 Cu 48Bitkhilngvintchcaelectronlnlt:9,1.10-31(kg)v-1,6.10-19(C);tcnhsng trong chn khng 3.108 (m/s). Tc ca mt lectron tng tc qua hiu in th105 V l: A. 0.4.108m/s B. 0.8.108m/s C. 1,88.108m/sD.1,6.108m/s Cu 49Trong thnghim Ing ,cckhe cchiu sng Bng nh sng trngc Bc sng t 0,38um n 0,76 um. Khong cch gia hai khe l 0,5 mm, khong cch gia haikhe n mn l 2 m. rng quang ph Bc 2 quan st c trn mn l: A. 1,52mmB. 3,04mm C. 4,56mD. 6,08mm T x OA T x O B T x OC T D x Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 35 Cu 50Mch RLC mc ni tip c mc vo dng in xoay chiu c phng trnh hiu in thu = 220 2 cos( 100tt +t/3) Vv phng trnhdngin l i = 22 cos( 100tt +t/2)A. Tmcng sutcamch in trn? A. 220WB. 440 WC. 2203 WC. 351,5W Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 36 P N 7 1C2D3C4A5C6A7A8B9A10D 11A12A13D14D15B16B17D18C19D20A 21C22D23C24B25D26A27A28C29B30C 31B32D33A34C35D36B37C38D39C40B 41D42C43A44D45B46D47B48C49B50C Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 37 GIO DC HNG PHC THI TH ( thi c 04 trang) THI TH I HC 2011 Mn thi: VT L; Khi A Thi gian lm bi: 90 pht, khng k thi gian pht . Cu 1:Mch dao ng ca mt my pht sng in t gm mt cun dy c t cm L = 20 H v mt t in c in dung C1 = 120 pF. my c th pht ra sng in t c bc sng = 113 m th ta c th: A. mc song song vi t C1 mt t in c in dung C2 = 60 pF.B. mc ni tip vi t C1 mt t in c in dung C2 = 180 pFC. mc ni tip vi t C1 mt t in c in dung C2 = 60 pF. D. mc song song vi t C1 mt t in c in dung C2 = 180 pF. Cu 2:mchin,khitmtinpxoaychiuvoABth 120 2 os(100 )AMu c t V t = v120 2 os(100 )3MBu c t Vtt = + .Biuthc in p hai u AB l: A.120 2 os(100 )4ABu c t Vtt = + B.240 os(100 )6ABu c t Vtt = +C.120 6 os(100 )6ABu c t Vtt = + D.240 os(100 )4ABu c t Vtt = +Cu 3:Chn pht biu sai. Mch in RLC ni tip ang xy ra cng hng. Nu tng L mt lng nh th: A. in p hiu dng trn in tr gim.B. Cng sut to nhit trn mch gim. C. in p hiu dng trn t in tng.D. in p hiu dng trn cun cm thuntng. Cu 4: Hin tng quang dn l A. Hin tng mt cht b pht quang khi b chiu nh sng vo. B. Hin tng mt cht b nng ln khi chiu nh sng vo.C. Hin tng gim in tr ca cht bn dn khi chiu nh sng vo D. S truyn sng nh sng bng si cp quang. Cu 5:Ha nh tinh na o sau a y trong hema t tr i co kho i l ng l n nha t? A. Hoa Tinh B. Mo c TinhC. ThoTinhD. Thie n Vng TinhCu 6:Con lc l xo ck = 90(N/m) , m = 800(g) c t nm ngang. Mtvin n m0 = 100(g) bay vi vn tc v0 = 18(m/s), dc theo trc l xo, n cm cht vo M. Bin v tn s gc dao ng ca con lc l:A. 20(cm); 10(rad/s) B. 2(cm); 4(rad/s)C. 4(cm); 25(rad/s)D.4(cm); 2(rad/s) Cu 7:Chn cu sai khi ni v dao ng cng bc A. Tn s dao ng bng tn s ca ngoi lc B. Bin dao ng ph thuc vo tn s ca ngoi lc C. Dao ng theo quy lut hm sin ca thi gian D. Tn s ngoi lc tng th bin dao ng tng Cu 8:Hin tng giao thoa nh sng l s kt hp ca hai sng nh sng tha mn iu kin: A. Cng tn s v cng bin .B. Cng pha v cng bin . C. Cng tn s v cng iu kin chiu sng.D. Cng tn s v lch pha khng i. Cu 9:Mt m truyn t nc ra khng kh th:A. Tn s khng i bc sng tng.B. Tn s tng,bc sng khng i. C. Tn s khng i,bc sng gim.D. Tn s gim, bc sng khng i. Cu 10: Mt ngun pht sng c dao ng vi phng trnh u = 2.cos(10tt) (cm). Trong thi gian 8 (s), sng truyn i c qung ng bng bao nhiu ln bc sng? A. 60 B. 20 C. 80D. 40 Cu 11:i lng sau y khng phi l c trng vt l ca sng m: A. Cng m.B. Tn s m.C. to ca m.D. th dao ng m. Cu 12: Mtmchinxoaychiugmmtcundyvmttincindungthayicmcni tip.tvohaiumchinnymtinpxoaychiuctnsvinphiudngkhngi,iu chnh in dung ca t sao cho in p hiu dng gia hai bn t c gi tr ln nht. Khi THI S 8 Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 38 A.in p gia hai u cun dy sm pha 2t so vi in p gia hai bn t. B. Cng sut tiu th trn mch l ln nht. C.Trong mch c cng hng in. D.in p gia hai u mch chm pha 2t so vi in p gia hai u cun dy. Cu 13:Trong onmch RLC khng phn nhnh, lch pha gia hai u cun dy v hai u tr thun R khng th bng A. t/6B. 3t/4C. t/4D. t/12 Cu 14:Mt onmch ni tipgmmtcundyvmtt in. Dngmt vn kc in tr rt ln oin p hai u cun dy, hai u t in, hai u c mch th thy vn k ch cng mt gi tr. H s cng sutm cosca mch l A. 41B. 21C. 22D. 23 Cu 15:Hiu in th gia ant v catt ca mt ng Rn ghen l 19 kV. Bit e=1,6.10-19C, c=3.108m/s. v h= 6,625.10-34 J.s. B qua ng nng ban u ca electron. Bc sng nh nht ca tia Rn ghen do ng pht ra l: A. 65,37 pm. B. 55,73 pm. C. 65,37u m.D. 55,73u m. Cu 16: Chiunhsngtrngcbcsngt0,38mn0,76mvohaikhecathnghimIng.Bit khong cch gia hai khe l 1mm, khong cch t hai khe ti mn l 3m. S bc x cho vn sng ti v tr vn ti th ba ca bc x c bc sng 0,5m l: A. 2 bc x.B. 1 bc x.C. 3 bc x.D. khng c bc x no Cu 17:Trong th nghim v giao thoa nh sng ca Y-ng, hai khe sng cch nhau 0,8mm. Khong cch t hai khe n mn l 2m,nh sng n sc chiu vo hai khe c bc sng = 0,64um. Vn sng bc 4 v bc 6 (cng pha so vi vn chnh gia) cch nhau on A.1,6mm.B. 3,2mm.C. 4,8mm.D. 6,4mm. Cu 18:Hiu in th giahai cc ca ng Rnghen l 15kV .Gi s lectrnbt ra t Catt c vn tc ban u bng khng th bc sng ngn nht ca tia X m ng c th pht ra l : A. 1082, 8.10 mB.1075, 5.10 mC.1275, 5.10 mD.82,8.10-12 mCu 19:e- ca 1 nguyn t H c mc nng lng c bn l 13,6 eV . Mc nng lng cao hn v gn nht l 3,4 eV . Nng lng ca nguyn t H mc th n l En = - 213, 6eVn ( vi n = 1,2,3,). iu g s xy ra khi chiu ti nguyn t chm phtn c nng lng5,1 eV ? A. e- hp th 1 phtn, chuyn ln mc nng lng- 8,5 eV ri nhanh chng tr v mc c bn & bc x phtn c nng lng 5,1 eVB. e- hp th 1 phtn, chuyn ln mc nng lng- 8,5 eV ri nhanh chng hp th thm 1 phtn na chuyn ln mc 3,4 eVC. e- hp th mt lc 2 phtn chuyn ln mc nng lng- 3,4 eV D. e- khng hp thphtn Cu 20:ngnngbanuccicaccelectrnquanginkhibtrakhicattcamttboquang inl2,065eV.Bitvntcccicaccelectrnquanginkhitiantl2,909.106 m/s,khilng electron 9,1.10-31 (kg), 1 eV = 1,6.10-19 J. Hiu in th gia ant (A) v catt (K) ca t bo quang in l A. UAK = - 24 VB. UAK = + 24 VC. UAK = - 22 VD.UAK = + 22 V Cu 21: Ht nhn 23492Ungyn phn r theo phng trnh23492AZU X o + . Bit nng lng ta ra trong phn ng trn l 14,15MeV, ng nng ca ht o l (ly xp x khi lng cc ht nhn theo n v u bng s khi ca chng) A. 13,72MeVB. 12,91MeVC. 13,91MeVD. 12,79MeV Cu 22:Qu trnh bin i tU23892 thnh chPb20682 ch xy ra phng x o v |-. S ln phn r o v |- ln lt l A. 8 v 10.B. 6 v 8.C. 10 v 6.D. 8 v 6. Cu 23: 2411Nal cht phng x | , ban u c khi lng 0,24g. Sau 105 gi phng x gim 128 ln. K t thi im ban u th sau 45 gi lng cht phng x trn cn li l A. 0,03gB. 0,21gC. 0,06gD. 0,09g Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 39 Cu 24:Mo t con la c ncooda i l, trongkhoa ng th i gianAt noth c hie n c6 dao o ng ieu ho a.Ng itagia mb to da icu ano i16cm,cu ngtrongkhoa ngth igianAtnhtr cno th chie n10dao o ng. Chie u da i cu a con la c ban au la A. 25m B. 25cmC. 9m D. 9cm Cu 25: Trong qu trnh lan truyn sng in t, vct cm ng t Bv vct in trng E lun lun A.Dao ng vung pha.B.Cng phng v vung gc vi phng truyn sng. C.Dao ng cng pha.D.Dao ng cng phng vi phng truyn sng. Cu 26:Dng inxoaychiu quamt onmchc biu thc 0os(120 )3i I c t Att = . Thi im th 2009 cng dng in tc thi bng cng hiu dng l: A. 120491440s B. 240971440s C. 241131440sD. p n khcCu 27:Dng quang in bo ha chy qua t bo quang in l 3,2 mA.Selectron quang in c gii phng ra khi catot trong mi giy l A. 2.1016.B. 5,12.1016.C. 2.1017. D. 3,2.1016. Cu 28:Ht nhn urani U234 ng yn, phn r o v bin thnh ht nhn thri (Th230). ng nng ca ht o bay ra chim khong bao nhiu phn trm nng lng phn r? Coi khi lng xp x bng s khi A. 1,68% B. 98,3% C. 16,8%D. 96,7% Cu 29:Tc lan truyn ca sng in t . A. Khng ph thuc vo mi trng truyn sng nhng ph thuc vo tn s ca sng B. Khng ph thuc vo c mi trng truyn sng v tn s ca sng C. Ph thuc vo c mi trng truyn sng v tn s ca sng D. Ph thuc vo mi trng truyn sng v khng ph thuc tn s ca sng Cu 30: Mtmchdaonggmmttincindung4200pFvmtcuncmctcmcm 275 u H, in tr thun 0,5O. duy tr dao ng trong mch viin p cc i trn t l 6 V th phi cung cp cho mch mt cng sut l A. 549,8u W.B. 274,9u W. C. 137,5 u W.D. 2,15 mW. Cu 31:CngdnginquamchA,Bcdng 0i I cos 100 t4t | |= t |\ .(A).Tithiimt=0,06(s), cng dng in c gi tr bng 0,5(A). Cng hiu dng ca dng in bng: A. 0,5(A) B. 1(A)C. 22(A) D.2 (A) Cu 32:Mch dao ng l tng LC. Dng ngun mtchiu c sut in ng 10 V cung cp cho mchmt nng lng 25 uJ bng cch np in cho t th dng in tc thi trong mch c sau khong thi gian t/4000 s li bng khng. t cm cun dy l A. L = 1 H;B. L = 0,125 H; C. L = 0,25 H; D. L = 0,5 H Cu 33:Tia pho ng xana o sau a y kho ng b le ch trong ttr ng? A. Tia o B Tia |+C. Tia |D. TiaCu 34:Ngun sng trong th nghim Giao thoa nh sng cng lc ba bc x n sc c bc sng 1 = 0,64um; 2 = 0,54um v 3 = 0,48 um. V tr trn mn ti ba vn sng trng nhau u tin k t vn sng trung tm l vn sng bc bao nhiu ca vn sng mu ? A. 27B. 15C. 36D. 9 Cu 35:Ngun sng trong th nghim v giao thoa sng nh sng c bc sng t 0,65um n 0,41um. Bit a = 4mm, D = 3m. M l mt im trn mn cch vn sng trung tm 3mm. Bc sng ca cc bc x n sc cho vn sng ti M l: A. = 0,57 um; 0,5um; 0,44umB. = 0,57 um; 0,55um; 0,4um C. = 0,47 um; 0,65um; 0,44umD. = 0,58 um; 0,5um; 0,4um Cu 36:Mt vt dao ng iu ha vi phng trnh l x = 4cos2t. Thi gian ngn nht vt i quan v tr cn bng k t thi im ban u l: A. t = 0,25sB. t = 0,75sC. t = 0,5sD. t = 1,25s Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 40 Cu 37:Vt dao ng iu ha vi phng trnh x = Acos( 8tt + t/6). Sau mt phn t chu k k t thi im ban u vt i c qung ng l bao nhiu? A. A2 + A B. A2 + A 32 C. A2 + A 22D. A + A 22

Cu 38:Mtchtimdaongiuhotheophngtrnh: cm t x )2cos( 3tt + = ,phadaongcacht im ti thi im t = 1s l A. 0(cm).B. 1,5(s).C. 1,5t (rad).D. 0,5(Hz). Cu 39:Hai ngun sng c AB cch nhau dao ng chm nh trn mt cht lng, cng tn s 100Hz, cng pha theo phng vung gc vi mt cht lng. Vn tc truyn sng 20m/s.S im khng dao ng trn on AB =1m lA. 10 im B. 20 imC. 5 imD. 11 im Cu 40:Trong th nghim Ing v giao thoa nh sng, hai khe Ing cch nhau 2 mm, hnh nh giao thoa c hng trn mn nh cch hai khe 1m. S dng nh sng n sc c bc sng , khong vn o c l 0,2 mm. Thay bc x trn bng bc x c bc sng '> th ti v tr ca vn sng th 3 ca bc x c mt vn sng ca bc x '.Bc x 'c gi tr no di y A. ' = 0,52mB. ' = 0,58mC. ' = 0,48mD. ' = 0,60m Cu 41:Cho ht vo ht nhn nhm(2713Al ) ang ng yn, sau phn ng sinh ra ht ntron v ht nhn X. , bit m =4.0015u, mAl = 26,974u, mX = 29,970u, mn = 1,0087u, 1uc2 = 931MeV. Phn ng ny to hay thu bao nhiu nng lng? Chn kt qu ng? A.To nnglng 2,9792MeV.B.To nnglng 2,9466MeV. C.Thu nnglng 2,9792MeV.D.Thu nnglng 2,9466MeV. Cu 42: Trn 1 dy di c sng truyn vi vn tc 10m/s. Phng trnh dao ng ti ngun S lu = 5sin 100 t (cm). Phng trnh dao ng ti M cch S mt khong 4 cm l A. u = 5sin (100 t + 2) (cm)B. u = 5sin 100 t (cm)C. u = 5cos (100 t + 2) (cm)D. u = 5sin (100 t 0,4 )(cm) Cu 43:Khi ma c tuie n coie n dung C1 v i cuo n ca m thua n L th ma ch thu c so ng cob c so ng 60m. Khi ma c tuie n coie n dung C2 v i cuo n L th ma ch thu c so ng cob c so ng 80m. Khi ma c no i tie p C1 vaC2 v i cuo n L th ma ch thu c so ng cob c so ng la : A. 48mB. 70mC. 100mD. 140m Cu 44:tvohaiuonmchRLCkhngphnnhnhinp xoay chiu u = 220 2 sin t t 100 (V), khi biu thcin p hai u t C c dng u =100sin( )2100tt t (V). Biu thc in p hai u in tr R l A. uR = 220 2 sin t t 100 (V)B. uR = 220sin t t 100 (V)C. uR =100sin( )2100tt t (V)D. uR =100 2 sin( )2100tt t (V Cu 45: C 2 cun dymc ni tip vi nhau,cun 1c t cm 1L ,in tr thun 1R ,cun 2 c t cm 2L ,in tr thun 2R .Bit1L2R = 2L1R.Hiu in th tc thi 2 u ca 2 cun dy lch pha nhau 1 gc: A.t /3B.t /6 C.t /4D. 0 Cu 46:Chiu mt bc x = 0,41 u m vo katt ca t bo quang in th Ibh = 60mA, cng sut ca ngun l 3,03W. bit h = 6,625.10-34 Js; e = 1,6.10-19 C; c = 3.108 m/s. Hiu sut lng t lA. 6%B. 9% C. 18% D. 25% Cu 47:Con lc ngm sidynhkhnggin,mt uc nh ,mt ugnvihn bikhi lngm. Ko vt ra khi VTCB sao cho si dy hp vi phng thng ng gc 0,1 rad ri th nh. Trong qu trnh dao ngcon lc lunchu tcdngca lccnc ln bng 1/500 trng lc tcdng ln vt. Coi chukdao ng l khng i trong qu trnh dao ng v bin dao ng gim u trong tng na chu k. S ln vt i qua VTCB k t lc th vt cho n khi vt dng hn lA. 25B. 50C. 75D. 100 B L, RC MA Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 41 Cu 48:Quang ph vch pht x l mt quang ph gm A. Mt s vch mu ring bit cch nhau bng nhng khong ti. B.Mt vch munm trn nn ti. C.Cc vch t ti tm cch nhau nhng khong ti. D. Cc vch ti nm trn nn quang ph lin tc. Cu 49:Trong th nghim giao thoa sng trn mt nc, hai ngun AB cch nhau 14,5cm dao ng ngc pha. im M trn AB gn trung im I ca AB nht, cch I l 0,5cm lun dao ng cc i. S im dao ng cc i trn ng elp thuc mt nc nhn A, B lm tiu im l A. 18 imB. 30 imC. 28 imD. 14 im Cu 50:Hai con lc n thc hin dao ng iu ha ti cng mt a im trn mt t. Hai con lc c cng khi lng qu nng dao ng vi cng nng lng, con lc th nht c chiu di l 1m v bin gc l o o, con lc th hai c chiu di dy treo l 1,44m v bin gc l o o 2. T s bin gc ca 2 con lc l: A. o o1 /o o2 = 1,2B. o o1/o o2 = 1,44C. o o1/o o2 = 0,69D. o o1/o o2 = 0,83 p n s 8 1A2C3C4C5B6A7D8D9A10D 11C12D13B14D15A16A17B18D19D20D 21C22D23A24B25C26A27A28B29C30C 31A32B33D34A35A36A37B38C39A40D 41C42D43A44A45D46A47A48A49C50A Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 42 GIO DC HNG PHC THI TH ( thi c 05trang) THI TH I HC 2011 Mn thi: VT L; Khi A Thi gian lm bi: 90 pht, khng k thi gian pht . Cu 1:Daongtnghpca2daongcngphng,cngtns,cngbin,cbin bng bin ca mi dao ng thnh phn khi 2 dao ng thnh phn A. lch pha / 2 B. ngc phaC. lch pha 2 /3D . cng pha Cu 2:Xt mt sng c truyn trn dy n hi, khi ta tng gp i bin ca ngun sng v gp ba tn s sng th nng lng sng tng ln gp A. 36 ln.B. 6 ln.C. 12 ln.D. 18 ln. Cu 3:on mch nh hnh v, uAB = 100 2 cos100tt(V). Khi K ng, I = 2(A), khi K m dng in qua mch lch pha 4t so vi hiu in th hai u mch. Cng dng in hiu dng qua mch khi K m l: A. 2(A)B. 1(A)C.2 (A)D.2 2 (A) Cu 4: tinpxoaychiuvohaiu onmchRLCnitipthccinphiudngc quan h3 UR=3UL=1,5UC. Trong mch cA. Dng in sm pha 6t hn in p hai u mch.B. Dng in tr pha 6t hn in p hai u mch. C. Dng in tr pha 3t hn in p hai u mch. D. Dng in sm pha 3t hn in p hai u mch. Cu 5:Nnglngcalectrontrongnguynthyr ctnhtheocngthc:En=- 2An,Al hngsdng,n=1,2,3,BitbcsngdinhtcabcxtrongdyLaimanl0,1215m. Bc sng di nht ca bc x trong dy Pa sen l A. 1,8745 m B. 0,8201 m C. 1,1224 mD. 1,4578 m Cu 6: Trongphngthnghimcmtlngchtphngx,banutrong1phtngitam c c 360 nguyn t ca cht b phn r, sau 2 gi trong 1 pht c 90 phn t b phn r. Chu k bn r ca cht phng x l A. 30 phtB. 60 phtC. 90 phtD. 45 pht Cu 7:Khi tnghp hai dao ng iu hocng phng cng tn s c bin thnh phn av 3 a c bin tng hp l 2a. Hai dao ng thnh phn A. Vung pha vi nhau B. Cng pha vi nhau.C. Lch pha 3t.D. Lch pha 6t. Cu 8: Mtconlclxodaongvibin6cm.Lct=0,conlcquavtrclix= 3 2 (cm) theo chiu dng vi gia tc c ln 32(cm/s2). Phng trnh dao ng ca con lc l: THI S 9 R B CL A K Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 43 A. x = 6cos9t(cm) B. tx 6cos3 4t | |= |\ .(cm) C. tx 6cos3 4t | |= + |\ .(cm) D.x 6cos 3t3t | |= + |\ .(cm) Cu 9:Mt ngun sng c dao ng vi bin khng i, tn s dao ng 100Hz. Hai im MN= 0,5m gn nhau nht trn phng truyn sng lun dao ng vung pha vi nhau. Vn tc truyn sng l A. 50m/sB. 200m/sC. 150m/s D. 100m/s Cu 10:Mch dao ng (L, C1) c tn s ring f1 = 7,5MHz v mch dao ng (L, C2) c tn s ring f2 = 10MHz. Tm tn s ring ca mch mc L vi C1 ghp ni tip C2. A. 12,5MHz.B. 15MHz.C. 8MHz.D. 9MHz. Cu 11:Biu thc ca in p hai u mt cun dy v cng dng in chy qua cun dy l V t u )61000 sin( 2 100t+ =vA t i )61000 sin( 2t = . in tr R v t cm ca cun dy l A. R = 50 ; L = 50 H 3 B. R = 25 ; L =H 087 , 0C. R =O 2 50 ; L =H 6 50 D. R =O 2 25 ; L = 0,061H Cu 12: Trong th nghim Ing v giao thoa nh sng, hai khe cch nhau 0,5 mm v c chiu sng bng mt nh sng n sc. Khong cch t hai khe n mn quan st l 2 m. Trn mn quan st, trong vng gia M v N (MN vung gc vi cc vngiao thoa, MN = 2 cm) ngi ta m c c 10 vn ti v thy ti M v N u l vn sng. Bc sng ca nh sng n sc dng trong th nghim ny l A. 0,7 m B. 0,6 m C. 0,5 m D. 0,4 m Cu 13: Hnh tinh no trong cc hnh tinh sau y xa Mt Tri nht ? A. Sao Kim B.Sao Ha C. Sao ThD. Tri t Cu 14:Mt vt dao ng iu ho, c qu do l mt on thng di 12cm. Bin dao ng ca vt lA.12cm;B.-6cm; C.6cm D.-12cm Cu 15:Con la c lo xo coocng k = 100N/m vava t m = 100g, dao ong tren ma t pha ng ngang, hesoma sa t gi a va t vama t ngang la u = 0,01, lay g= 10m/s2. Sau mo i la n va t chuye n o ng qua v tr ca n bang, bien o dao o ng gia m mo t l ngAA la :A. 0,1cmB. 0,1mm C. 0,2cmD. 0,2mm Cu 16:Khi tng hp hai dao ng iu ho cng phng cng tn s c bin thnh phn 4cm v 4 3 cm c bin tng hp l 8cm. Hai dao ng thnh phn A. vung pha vi nhau. B. cng pha vi nhau.C. lch pha 3t. D. lch pha 6t. Cu 17:Mt dy AB di 2,40m cng thng nm ngang, u B c nh, u A gn vo mt bn rung vi tn s 100Hz. Khi bn runghot ng trn dyc sng dngvi 6 b sng, vi A xemnh mt nt. Bc sng v vn tc truyn sng trn dy ln lt l A. = 0,30m; v = 30m/ B. = 0,30m; v = 60m/s C. = 0,60m; v = 60m/sD. = 0,80m; v = 80m/s Cu 18:m sc l mt c tnh sinh l ca m cho php phn bit c hai m A. C cng bin c pht ra cng mt nhc c ti hai thi im khc nhau. B. C cng bin pht ra bi hai nhc c khc nhau. C. C cng tn s pht ra bi hai nhc c khc nhau. D. C cng to pht ra bi hai nhc c khc nhau. Cu 19:Sng no c dng trong truyn hnh bng sng v tuyn in: A. Sng ngnB. Sng diC. Sng cc ngnD. Sng trung Cu 20: Chncusaitrongcccusau.MchinxoaychiuRLCnitipangxyracng hng. Nu thay i tn s ca in p t vo hai u mch th Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 44 A. in p hiu dng trn L tng.B. Cng sut trung bnh trn mch gim. C. Cng hiu dng qua mch gim.D. H s cng sut ca mch gim. Cu 21:ChoonmchRLCnitip,trongcundythuncmL=1/t(H);tincin dung C = 16 uF v tr thun R. t in p xoay chiu tn s 50Hz vo hai u on mch. Gi tr ca R cng sut ca mch t cc i lA. R = 100 2 O B. R = 100 OC. R = 200O D. R = 200 2OCu 22: Mchin(hnhv)cR=100; 4102C Ft= .Khi t vo AB mt in p xoay chiu c tn sf = 50 Hz th uAB v uAM lch pha nhau 2t Gi tr L l A. 1L Ht= B. 3L Ht= C. 3L Ht= .D. 2L Ht= . Cu 23:Trong mch in xoay chiu tn s gcech gm hai phn t R v C mc ni tip, gi U,I l cc gi tr hiu dng ca hiu in th v dng in ca mch in. Kt lun no sau y l sai? AHiu in th ca mch in chm pha hn dng in.B. I= 2 2) (+ C RUe. C. Cng sut tiu th ca mch in l UI.D. Tng tr ca mch in l Z=2 2CZ R + . Cu 24:Chn cu sai. A. Mi nh sng n sc c mt bc sng v tn s xc nh. B. Chit sut ca cht lm lng knh i vi nh sng n sc c bc sng cng ngn th cng ln. C.Mi nh sng n sc c mt mu sc v tn s nht nh. D.Tc truyn ca cc nh n sc khc nhau trong cng mt mi trng th khc nhau. Cu 25:Chn cu ng.A. Quang ph lin tc ca mt vt ph thuc vo bn cht ca vt nng sng. B. Quang ph lin tc khng ph thuc vo nhit ca vt nng sng. C. Quang ph lin tc ph thuc vo nhit ca vt nng sng. D. Quang ph lin tc ph thuc vo nhit v bn cht ca vt nng sng. Cu 26: Chiu ln lt cc bc x c tn s f, 2f, 4f vo catt ca t bo quang in th vn tc ban u cc i ca electron quang in ln lt l v, 2v, kv. Xc nh gi tr k? A.10 B. 4C.6D.8 Cu 27: Trong hin tng quang-pht quang, s hp th hon ton mt photon s a n : A. S gii phng mt electron t do B. S gii phng mt electron lin kt C. S gii phng mt cp electron v l trngD. s pht ra mt photon khc Cu 28: Trongquangphcanguynthir,cmtvchquangphcbcsngnmtrong khong t 0,37 m n 0,39 m. Hi vch thuc dy no? A. Lai-man.B.Pa-sen. C. Ban-me hoc Lai-man.D. Ban-me. Cu 29: Chu k bn r ca 2 cht phng x A & B ln lt l T1 & T2 . Bit T1 = 12 .T2 . Ban u , hai khi cht A & B c s lng ht nhn nh nhau . Sau thi gian t = 2T1 t s cc ht nhn A & B cn li lA. 1 / 3B. 2 C. 1 / 2D. 1 Cu 30:Nhn xt no v phn ng phn hch v phn ng nhit hch l khng ng? A.S phn hch l hin tng mt ht nhn nng hp th mt ntron chm ri v thnh hai ht nhn trung bnh cng vi 2 hoc 3 ntron. Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 45 B.Phn ng nhit hch ch xy ra nhit rt cao . C.Bom khinh kh c thc hin bi phn ng phn hch. D. Con ngi hin ti ch thc hin c phn ng nhit hch di dng khng kim sot cCu 31: Nng lng ta ra trong qu trnh phn chia ht nhn ca mt kg nguyn tU23592l 5,13.1026 MeV.Cnphitmtlngthanbaonhiucmtnhitlngnhth.Bitnngsutta nhit ca than l 2,93.107 J/kg.A. 28 kg B.28.105 kg C. 28.107 kg D. 28.106 kgCu 32:Mo t cha t phong xaco kho i lng M0,chu k ban raT. Sau thi gian t=4T, th kho i lng cn li l. A. M 032B. M 016 C. 15M 016 D. 31M 032

Cu 33: 238Uphn r thnh 206Pb vi chu k bn r 4,47.109nm. Mt khi c pht hin cha 46,97mg 238U v 2,315mg 206Pb. Gi s khi khi mi hnh thnh khng cha nguyn t ch v tt c lng ch c mt trong u l sn phm phn r ca 238U . Tui ca khi hin nay l bao nhiu? A.~2,6.109 nm.B.~2,5.106 nm.C.~3,57.108 nm.D.~3,4.107 nm. Cu 34: Chn pht biu sai khi ni v s phng x ca ht nhn nguyn t: A. Ti mt thi im, khi lng cht phng x cng ln th s phn r cng ln. B. phng x ti mt thi im t l vi s ht nhn phn r tnh n thi im . C. phng x ph thuc vo bn cht ca cht phng x. D. Mi phn r l mt phn ng ht nhn ta nng lng. Cu 35:i vi my pht in xoay chiu c cng sut ln th n c cu to sao cho A. stato l mt nam chm vnh cu ln B.stato l phn ng v roto l phn cmC. stato l phn cm v roto l phn ngD. roto l mt nam chm in ln Cu 36:Mt my bin p c s vng cun s cp l 2200 vng. Mc cun s cp vo mng in xoay chiu 220 V 50 Hz, khi in p hai u cun th cp h l 6 V. S vng dy cun th cp lA. 80 vngB. 42 vngC. 60 vngD. 30 vng Cu 37:Ht nhn 22688Ra ban u ang ngyn th phng ra ht c ng nng 4,80MeV. Coi khi lng mi ht nhn xp x vi s khi ca n. Nng lng ton phn ta ra trong s phn r ny l A. 4,89MeVB. 4,92MeVC. 4,97MeVD. 5,12MeV Cu 38: 2411Nal cht phng x | , ban u c khi lng 0,24g. Sau 105 gi phng x gim 128 ln. K t thi im ban u th sau 45 gi lng cht phng x trn cn li l A. 0,03gB. 0,21gC. 0,06gD. 0,09g Cu 39: Mt vt dao ng iu ha, khi vt i t v tr cn bng ra im gii hn th A.Chuyn ng ca vt l chm dn u.B.Th nng ca vt gim dn. C. ln vn tc ca vt gim dn.D.Lc tc dng ln vt c ln tng dn. Cu 40: Hai l xo c cng l k1, k2 v mt vt nng m = 1kg. Khi mc hai l xo song song th to ra mt con lc dao ng iu ho vi1= 10 5 rad/s, khi mc ni tip hai l xo th con lc dao ng vi2 = 2 30 rad/s. Gi tr ca k1, k2 l A: 100N/m, 200N/mB: 200N/m, 300N/m C. 100N/m, 400N/m D. 200N/m, 400N/m Cu 41:Mo tda ya n da i40cm,ca nghaia uconh,khi daydao o ngv ita nso 600Hz,ta quan sa t tre n day cosong dng v i hai bu ng song. To c otruye n so ng tren da y laA. 79,8m/sB. 120m/sC. 240m/sD. 480m/s Cu 42: Trong mch thu sng v tuyn ngi ta iu chnh in dung ca t C = 1/4000t(F) v t cm ca cun dy L = 1,6/t (H). Khi sng thu c c tn s bao nhiu? Ly t2 = 10. A. 200Hz.B. 100Hz.C. 50Hz.D. 25Hz. Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 46 Cu 43:thiu inthu=100 2 sin t t 100 (V)vohaiu onmchRLCnitip,bitL= Ht1,hiu in thhiu dng hai u in tr R bng hai u tC v bng100V .Cng sut tiu th mch in l A. 250W B. 200WC. 100 W D. 350W Cu 44: Trong ng c in nng cao h s cng sut th A. Ghp song song ng c vi mt t in.B. ghp ni tip ng c vi mt cun cm. C. Ghp ni tip ng c vi mt t in.D. ghp song song ng c vi mt cun cm. Cu 45:Tnh cht no sau y khng phi ca tia X: A. Tnh m xuyn mnh.B. Xuyn qua cc tm ch dy c cm. C. In ha khng kh.D. Gy ra hin tng quang in. Cu 46:Trong quang phca nguyn t hiro, ba vch u tin trong dy Lai man c bc sng1 = 121,6 nm;2 = 102,6 nm;3 = 97,3 nm. Bc sng ca hai vch u tin trong dy Ban me lA. 686,6 nm v 447,4 nm.B. 660,3 nm v 440,2 nm.C. 624,6nm v 422,5 nm. D. 656,6 nm v 486,9 nm. Cu 47: Chn cu pht biu khng ng A. Ht nhn c nng lng lin kt ring cng ln th cng bn vng B. Khi lc ht nhn lin kt cc nuclon to thnh ht nhn th lun c s ht khi C. Ch nhng ht nhn nng mi c tnh phng x D. Trong mt ht nhn c s ntron khng nh hn s protn th ht nhn c c hai loi ht ny Cu 48:Gis mt hnh tinh c khilng c Tri tca chng ta (m=6.1024 kg)va chmv b hy vi mt phn hnh tinh, th s to ra mt nng lng A. 1,08.1042JB. 0,54.1042JC. 2,16.1042JD. 0J Cu 49:Dng in ba pha mc hnh sao c ti i xng gm cc bng n. Nu dy trung ho b t th cc bng nA. c sng tngB. c sng khng i C. c sng gim D. khng sng Cu 50:Chn sai khi ni v cu to my dao in ba pha. A.stato l phn ng.B.phn ng lun l rto. C.phn cm lun l rto.D.rto thng l mt nam chm in.

Bin son: GV Nguyn Hng Khnh09166.01248 Gio Dc Hng Phc - Ni Khi u c M!Trang 47 P N S 9 1C2A3C4A5A6B7A8B9B10A 11D12C13C14C15D16A17D18C19C20A 21B22A23C24A25C26A27D2