B.Bi tp v: Lng t nh sng1.Ngi ta chiu nh sng c nng lng photon 5,6eV vo mt l kim loi c cng thot 4eV. Tnh ng nng ban u cc i ca cc quang electron bn ra khi mt l kim loi. Cho bit e = -1,6.10-19 C. A. 9,6 eV. B. 1,6.10-19 J C. 2,56.10-19 J. D. 2,56 eV. 2.Catt ca mt t bo quang in c cng thot 4eV. Tm gii hn quang in ca kim loi dng lm catt. Cho hng s Planck h = 6,625.10-34J.s; in tch electron e = -1,6.10-19C; vn tc nh sng c = 3.108m/s. A. 3105. B. 4028. C. 4969. D. 5214. 3.Cng thot lectrn ca mt kim loi l A th bc sng gii hn quang in l . Nu chiu nh sng kch thch c bc sng vo kim loi ny th ng nng ban u cc i ca cc quang electron l A. Tm h thc lin lc ng? A. = . B. = 0,5. C. = 0,25. D. = 2/3. -34 8 -19 4.Cho h = 6,625 .10 J.s ; c = 3.10 m/s ;1 eV = 1,6 .10 J. Kim loi c cng thot lectrn l A = 2,62 eV. Khi chiu vo kim loi ny hai bc x c bc sng 1 = 0,4 m v 2 = 0,2 m th hin tng quang in: A. xy ra vi c 2 bc x. C. xy ra vi bc x 1 , khng xy ra vi bc x 2 . B. khng xy ra vi c 2 bc x. D. xy ra vi bc x 2 , khng xy ra vi bc x 1 . 5.Khi chiu hai nh sng c bc sng 1 = 3200 v 2 = 5200 vo mt kim loi dng lm catt ca mt t bo quang in, ngi ta thy t s cc vn tc ban u cc i ca cc quang electron bng 2. Tm cng thot ca kim loi y. Cho bit: Hng s Planck, h = 6,625.10-34J.s; in tch electron, e = -1,6.10-19C; vn tc nh sng c = 3.108m/s. A. 1,89 eV. B. 1,90 eV. C. 1,92 eV. D. 1,98 eV. 6.Khi Chiu vo t bo quang in bc x c bc sng = 0,48 m th c hin tng quang in . triu tiu dng quang in ,phi t hiu in th Uh =0.7v gia Ant v catt .Hiu in th hm ny thay i th no khi bc sng bc x tng 1,5 ln A Uh =0,86 v B Uh =0,68 v C Uh =0,76 v D Uh =0,72 v 7.Chiu mt chm sng t ngoi c bc sng 0,25(m) vo mt l vnfram c cng thot 4,5(eV). Tnh vn tc ban u cc i ca electron quang in bn ra khi mt l vnfram. Cho me = 9.1031(kg): A. 4,08.105(m/s) B. 8,72.105(m/s) C. 1,24.106(m/s) D. 4,81.105(m/s) 8.Xc nh cng thot ca electron ra khi kim loi vi = 0,330(m), U hm c gi tr 1,38(V): A. 4.1019(J) B. 3,015.1019(J) C. 3,8.1019(J) D. 2,10.1019(J) 9.Khi chiu bc x c bc sng 1 = 0,2(m) vo mt tm kim loi c lp, th thy quang electron c vn tc ban u cc i l 0,7.106(m/s). Nu chiu bc x c bc sng 2 th in th cc i ca tm kim loi l 3(V). Bc sng 2 l: A. 0,19(m) B. 2,05(m) C. 0,16(m) D. 2,53(m) 11.: tm gi tr hng s Plng , ngi ta dng th nghim hin tng quang in vi t bo quang in, trong c b ngun in khng i mc ni tip vi t bo quang in. Khi chiu ln lt hai bc x f1, f2 vo catt ca t bo quang in v gim hiu in th UAK gia hai in cc dng quang in bt u trit tiu th cc hiu in th cn Uc < 0 c ln ln lt l Uc1 v Uc2. Biu thc tnh hng s Plng l: A. h = e

U C1 U C 2 f1 f 2

B. h =

U C1 U C 2 e( f1 f 2 )

C. h = 2e

U C1 U C 2 f1 f 2

D. h = e

f1U C1 f 2U C 2 f1 f 2

12.Catt ca mt t bo quang in c cng thot A = 2,9.10-19 J, chiu vo t bo quang in nh sng c bc sng = 0,4 Tm iu kin ca hiu in th gia ant v catt cng dng quang in trit tiu. Cho h = m. 6,625.1034 J.s ; c = 3.108 m/s; e = 1,6.10-19 C. A. UAK = 1,29 V B. UAK = -2,72 V C. UAK -1,29 V D. UAK = -2,29 V 13.Ln lt chiu vo catt ca mt t bo quang in hai bc x n sc v vng. Hiu in th hm c ln tng ng l U h = U1 v U hv = U 2 . Nu chiu ng thi hai bc x vo catt th hiu in th hm va trit tiu dng quang in c gi tr l A. U h

= U1 .

B. U h

= U2 .

C. U h

= U1 + U2 .

D. U h

1 = (U1 + U2 ) . 2 3c . 2f

14.Ln lt chiu vo catt ca mt t bo quang in hai bc x n sc f v 1,5f th ng nng ban u cc i ca cc lectron quang in hn km nhau 3 ln. Bc sng gii hn ca kim loi dng lm catt c gi tr A. 0 =

c . f

B. 0 =

4c . 3f

C. 0 =

3c . 4f

D. 0 =

15.Catt ca mt t bo quang in lm bng Cs c cng thot lectron A = 2eV, c chiu bi bc x c = 0,3975 m. Tnh hiu in th UAK hm dng quang in. Cho h = 6,625.10-34J.s; c = 3.108m/s; e = 1,6.10-19C. A. 2,100 V. B. 3,600 V. C. 1,125 V. D. 0 V.

16.Trong th nghim vi t bo quang in, khi chiu vo catt chm nh sng n sc c bc sng , dng quang in trit tiu th UAK = -0,85V. Nu hiu in th UAK = 0,85V, th ng nng cc i ca lectron quang in khi n ant s l bao nhiu? A. 2,72.1019J. B. 1,36.1019J. C. 0 J D. Khng tnh c v cha thng tin. 17.Trong th nghim vi t bo quang in, khi chiu vo catt chm nh sng n sc c bc sng 3.10-7m, th hiu in th hm o c c ln l 1,2V. Suy ra cng thot ca kim loi lm catt ca t bo l A. 8,545.10- 19J. B. 4,705.10-19J. C. 2,3525.10-19J. D. 9,41.10-19J. 18.Chiu mt chm nh sng n sc c bc sng 400 nm vo catt ca mt t bo quang in, c lm bng Na l 0, 5 m . Vn tc ban u cc i ca quang lectron l: A. 3,28.105 m/s. B. 4,67.105 m/s. 5 C. 5,45.10 m/s. D. 6,33.105 m/s. 19.Chiu vo catt ca mt t bo quang in mt chm bc x n sc c bc sng 0,330 m . trit tiu dng quang in cn mt hiu in th hm c gi tr tuyt i l 1,38 V. Gii hn quang in ca kim loi dng lm catt l A. 0,521 m. B. 0, 442 m. C. 0, 440 m. D. 0,385 m. 20.Chiu mt chm bc x n sc c bc sng 0,5 m vo catt ca mt t bo quang in c gii hn quang in l 0, 66 m . Vn tc ban u cc i ca lectron quang in l A. 2,5.105 m/s. B. 3,7.105 m/s. C. 4,6.105 m/s. D. 5,2.105 m/s. 21.Chiu mt chm bc x n sc c bc sng 0,5 m vo catt ca mt t bo quang in c gii hn quang in l 0, 66 m . Hiu in th cn t gia ant v catt trit tiu dng quang in l A. 0,2 V. B. 0,2 V. C. 0,6 V. D. 0,6 V. 22: Chiu mt chm bc x n sc c bc sng 0, 20 m vo mt qu cu bng ng, t c lp v in. Gii hn quang in ca ng l 0,30 m . in th cc i m qu cu at c so vi t l A. 1,34 V. B. 2,07 V. C. 3,12 V. D. 4,26 V. 23.Gii hn quang in ca kim loi dng lm catt l 0 = 0,30 m. Cng thot ca kim loi dng lm catt l: A. 1,16 eV. B. 2,21 eV. C. 4,14 eV. D. 6,62 eV. 24.Chiu mt chm bc x c bc sng = 0,18 m vo catt ca mt t bo quang in. Gii hn quang in ca kim loi dng lm catt l = 0,30 m. Vn tc ban u cc i ca lectron quang in l: A. 9,85.105 m/s. B. 8,36.105 m/s. C. 7,56.105 m/s. D. 6,54.105 m/s. 25.Chiu mt chm bc x c bc sng = 0,18 m vo catt ca mt t bo quang in. Gii hn quang in ca kim loi dng lm catt l = 0,30 m. Hiu ien th hm trit tiu dng quang in l: A. Uh = 1,85 V. B. Uh = 2,76 V. C. Uh = 3,20 V. D. Uh = 4,25 V. 26.Kim loi dng lm catt ca mt t bo quang in c cng thot l 2,2e V. Chiu vo catt bc x in t c bc sng . trit tiu dng quang in cn t c mt hiu in th hm Uh = UAK = 0,4 V. Gii hn quang in ca kim loi dng lm catt l: A. 0,434.10-6 m. B. 0,482.10-6 m. C. 0,524.10-6 m. D. 0,478.10-6 m. 27.Chiu mt bc x in t vo catt ca mt t bo quang in. trit tiu dng in cn t vo mt hiu in th hm Uh = UAK = 0,4 V. Vn tc ban u cc i ca lectron quang in l: A. 3,75.105 m/s. B. 4,15.105 m/s. C. 3,75.106 m/s. D. 4,15.106 m/s. 28.Kim loi dng lm catt ca mt t bo quang in c cng thot 2,2 eV. Chiu vo catt bc x in t c bc sng . trit tiu dng quang in cn t c mt hiu in th hm Uh = UAK = 0,4 V . Tn s ca bc x in t l: A. 3,75 .1014 HZ. B.4,58.1014 HZ. C. 5,83 .1014 HZ. D. 6,28 .1014 HZ. 29.Chieu mot chum bc xa n sac vao mot tam kem co gii han quang ien 0,35 m . Hien tng quang ien se khong xay ra khi chum bc xa co bc song la A. 0,1 m B. 0,2 m C. 0,3 m D. 0,4 m 30.Chieu mot chum anh sang n sac co bc song 400 nm vao catot cua mot te bao quang ien, c lam bang Na. Gii han quang ien cua Na la 0,50 m . Van toc ban au cc ai cua electron quang ien la A. 3,28 . 105 m/s. B. 4,67 . 10 5 m/s. C. 5,45 . 105 m/s. D. 6,33 . 105 m/s. 31.Chieu vao catot cua mot te bao quang ien mot chum bc xa n sac co bc song 0,330 m . e triet tieu dong quang ien can mot hieu ien the ham co gia tr tuyet oi la 1,38V. Cong thoat cua kim loai dung lam catot la A. 1,16 eV B. 1,94 eV C. 2,38 eV D. 2,72 eV

32. Xc nh cng thot ca electron ra khi kim loi vi nh sng kch thch c bc sng = 330nm, hiu in th 19 19 hm 1,38V. A. 6.10 B. 3,81.10 J JC.

4.10 19 J

.

D.

2,1.10 19 J .

33. Chiu chm nh sng c bc sng = 0,666m vo catt ca mt t bo quang in th phi t mt hiu in th 20 19 hm 0,69V va trit tiu dng quang in. Cng thot ca electron l : A. 2,5.10 B. 1,907 .10 J JC. 1,206 .1018

J

D. 1,88.10

19

J

34. Chiu tia t ngoi c bc sng = 250nm vo catt mt t bo quang in. Gii hn quang in l 0,5m. ng nng ban u cc i ca electron quang in l :

3,97.10 19 J 19 C. 3,18.10 JA.

4,15.10 19 J . 19 D. . 2,75.10 JB.

35. Cng thot ca electron khi catt ca t bo quang in l 1,88eV. Chiu v catt mt nh sng c bc sng = 0,489m. Vn tc cc i ca electron khi thot ra khi catt l : A. 0,52.106 m/s. B. 1,53.105 m/s. 5 6 C. 0,12.10 m/s. D.0,48.10 m/s. 36. Xc nh cng thot ca electron ra khi kim loi vi nh sng kch thch c bc sng = 330nm, hiu in th hm Uh = -1,25V. A.1,25 eV. B. 2,51 eV. C. 4eV. D. 1,51 eV. 37. Chiu mt chm bc x c bc sng vo catt mt t bo quang in. Bit cng dng quang in bo ha l 2mA. S electron quang in thot khi catt trong mi pht l : A. n = 1,25.1016 ht. B. n = 7,5.1017 ht. 15 C. n = 7,5.10 ht. D. n = 12,5.1018 ht. 38. Catt ca mt t bo quang in c gii hn quang in l 0,66m. Chiu vo catt nh sng t ngoi c bc sng 330nm. dng quang in trit tiu th hiu in th gia ant v catt phi l : A. UAK -1,16 (V) B. UAK -2,35 (V) C. UAK -2,04 (V) D. UAK -1,88 (V). 39. Cng dng quang in bn trong mt t bo quang in l I = 8A. S electron quang in n c ant trong 1 giy l : A. 4,5.1013 ht B. 6.1014 ht. 12 C. 5,5.10 ht. D.5.1013 ht 40. Chiu ln lt vo catt ca mt t bo quang in cc bc x c nhng bc sng sau 1 = 0,18m, 2 = 0,21m, 3 = 0,28m, 4 = 0,32m, 5 = 0,44m. Nhng bc x no gy ra c hin tng quang in ? Bit cng thot ca electron l 4,5eV. A. c 5 bc x trn B. 1, 2, 3 v 4. C.1 v 2. D. 1, 2 v 3 41. Cng sut pht x ca mt ngn n l 20W. Bit n pht ra nh sng n sc c bc sng 0,5m. S phtn pht ra trong mi giy l : A.4,96.1019 ht 20 18 B. 3,15.10 ht C. 6,24.10 ht D. 5,03.1019 ht. 42. Catt ca mt t bo quang in c cng thot electron l 4,14eV. Chiu vo catt mt bc x c bc sng = 0,2m. Hiu in th gia ant v catt phi tha mn iu kin g khng c electron no ti c ant ? A. UAK = 5,14 (V). B. UAK = -5,14 (V). C. UAK 2,07 (V) D. UAK -2,07 (V). 43. Kim loi dng lm catt ca mt t bo quang in c cng thot electron l 2,2eV. Chiu vo catt mt bc x c bc sng . Mun trit tiu dng quang in, ngi ta phi t vo ant v catt mt hiu in th hm Uh = 0,4V. Bc sng c gi tr l:A. 0,577m B. 0,677m. C. 0,377m. D. 0,477m.

44. Khi chiu bc x c tn s f = 2,538.1015 Hz ln catt ca mt t bo quang in th cc electron bc ra khi catt s khng ti c ant khi UAK -8V. Nu chiu ng thi vo catt hai bc x 1 = 0,4m v 2 = 0,6m th hin tng quang in s xy ra i vi bc x no ? A. 1. B. 1 v 2. D.2 D. khng c xy ra hin tng quang in. 45. Cng dng in bo ha bng 40A th s electron b bt ra khi catt t bo quang in trong 1 giy l: A.25.1013 B. 25.1014 C. 50.1012 D. 5.1012

53. Bit dng quang in trit tiu khi hiu in th hm l 12V. Vn tc ban u cc i ca electron quang in A.1,03.106 m/s B. 2,05.106 m/s. 6 C. 1,45.10 m/s. D. 1,45.106 m/s. 46. Gii hn quang in ca Canxi l 0 = 0,45m th cng thot ca electron ra khi b mt lp Canxi l: A. 5,51.10-19J B. 3,12.10-19J -19 C. 4,41.10 J D. 4,5.10-19J

47 Catt ca mt t bo quang in lm bng x i c gii hn quang in l 0,66m. Chiu vo Catt nh sng t ngoi c bc sng 0,33m. ng nng ban u cc i ca quang electron l:A. 3,01.10-19J; B. 3,15.10-19J; C. 4,01.10-19J; D. 2,51.10-19J

48 Gii hn quang in ca Natri l 0,50m. Chiu vo Natri tia t ngoi c bc sng 0,25m. Vn tc ban u cc i ca electron quang in l:A. 9.105m/s B. 9,34.105m/s C. 8.105m/s D. 8,34.105m/s

49 Nng lng photn ca tia Rnghen c bc sng 0,05 A0 l:A. 39.10-15J B. . 42.10-15J C. . 39,72.10-15J D. . 45.10-15J

50. Mt t bo quang in c catt bng Na, cng thot ca electron ca Na bng 2,1eV. Chiu vo t bo quang in bc x n sc c bc sng 0,42m.Gii hn quang in ca Na l: A. 0,59m B. 0,65 C. 0,49m D. 0,63m 51. Hiu in th nh nht gia i m cc v catt tia Rnghen c bc sng bng 1A0 l: A. 1500V B. 12400V C. 12500V D. 1000V * Dng cc d kin sau lm hai cu 22 v 23: Hiu in th gia hai ant v catt ca mt ng tia Rghen l 200kV. 52. ng nng ca electron khi n i catt (cho rngvn tc ca n khi bc ra khi catt l Vo=0) a 1,6.10 13 J b. 3,2.1010J c.1,6.1014J d)3,2.1014J 53. Bc sng ngn nht ca tia Rnghen m ng c th pht ra a) 5,7.10-11 m b) 6.10-14m c) 6,2.10-12m d) 4.10-12m 54. Trong mt t bo quang in c dng quang in bo ho Ibh= 2 A v hiu sut quang in l H=0,5%. S phtn ti catt trong mi giy l: a) 4.1015 b) 3.1015 c)2,5.1015 d) 5.1014 55. Gii hn quang in ca ng l 0,30 m. Cho h = 6,62.10-34Js ;c=3.108m/s , e= 1,6.10-19(c) .Cng thot ca electron khi ng a) 3,6(eV) b) 4,14(eV) c) 2,7(eV) d)5(eV) * Dng cc d kin sau lm 2 cu 26 v 27 - Chiu nh sng n sc c bc sng 0,5 m vo catt ca mt t bo quang in lm bng xdi, c gii hn quang in l 0,66 m 56. Vn tc ban u cc i ca electron quang in a) 4,6.107m/s b. 4,2.105m/s c) 4,6.105m/s d)5.106m/s 57. Hiu in th hm ca t bo qung in ny l: a) Uh=-0,3(V) b)Uh=-0,6(V) c) Uh=-2(V) d) Uh=-3(V) 58. Khi chiu mt bc x t c c bc sng vo tm kim loi c t c lp v in th in th cc i t c l 3(v) bc sng ca bc x l: a) 0,25 m b) 0,1926 m c) 0,18 m d) 0,41 m 59. Cho gii hn quang in ca catt mt t bo quang in l 0 =0,66 m v t gia catt v catt 1 hiu in th UAk =1,5(V). Dng bc x chiu n catt c =0,33 m ng nng cc i ca quang electron khi p vo ant l: a) 5.10-18 J b) 4.10-20 J c) 5.10-20 J d) 5,41.10-19J 60. Catt ca mt t bo quang in lm bng kim loi c gii hn quang in 0 = 0,5 m. Mun c dng quang in trong mch th nh sng kch thch c tn s : A. f 2,5.1014 Hz. B. f 5,2.1014 Hz. 14 C. f 6,0.10 Hz. D. f 8,0.1014 Hz. 61 Chiu bc x in t c bc sng vo catot ca t bo quang in th lectron quang in b bt ra c ng nng ban u cc i bng 2,43.10-19J. Cho bit cng thot ca kim li lm catt l 5,52.10-19J. 1. Tnh gii hn quang in ca kim loi lm catt 2. Tnh vn tc ban u cc i ca lectron quang in v bc sng . 3. Chiu ng thi 2 bc x in t c bc sng 1 = 0,5 m v 2 = 0,4 m vo catt ca t bo quang in trn, phi t hiu in th hm bng bao nhiu trit tiu dng quang in. Cho h = 6,625.10 -34 J.s; c = 3.108 m/s. 62 Chiu chm bc x c bc sng = 0,2 m vo mt tm km loi, cc lectron quang in bn ra c ng nng cc i bng 5eV. Khi chiu vo tm kim loi 2 bc x c bc sng 1 = 1,6 m v 2 = 0,1 m th c hin tng quang in xy ra khng: Nu c tnh ng nng cc i ca cc lectron quang in bn ra. Cho h = 6,625.10 34 J.s; c = 3.108m/s. 63 Chiu mt chm nh sng c tn s f = 7.108 Hz ln lt vo hai bn kim loi nhm v ka li. Gii hn quang in ca nhm 01 = 0,36 m, ca kali 02 = 0,55 m.Hin tng g s xy ra khi chiu chm nh sng vo bn nhm v bn kali. Tnh vn tc ban u cc i cua lectron quang in khi bt ra khi bn kim loi. Cho bit: h = 6,625.1034J.s; c =3.108 m/s, me = 9,1.10-31 kg.

64 Mt ng Rn-ghen pht ra bc x c bc sng nh nht l 5.10-11m, cng dng in qua ng l 10mA. 1. Tnh nng lng ca phton Rn-ghen tng ng, hiu in th t vo hai cc ca ng Rn- Ghen, vn tc ca lectron ti p vo i catt. 2. Tnh s lectron p vo i catt trong 1 pht. Bi tp v mu nguyn t Borh (Bo) 1. Mt nguyn t chuyn t trng thi dng c mc nng lng Em = - 1,5eV sang trng thi dng c c mc nng lng Em = - 3,4eV. Tn s ca bc x m nguyn t pht ra l: A. 6,54.1012Hz B. 4,58.1014Hz C. 2,18.1013Hz D. 5,34.1013Hz 2. Trong quang ph ca hidro vch th nht ca dy Laiman = 0,1216m; vch H ca dy Banme =0,6560m; vch u tin ca dy Pasen 1=1,8751m. Bc sng ca vch th ba ca dy Laiman bngA. 0,1026m B. 0,0973m C. 1,1250m D. 0,1975m

3. Vch quang ph u tin ca cc dy Banme v Pasen trong quang ph ca nguyn t hidro c bc sng ln lt l 0,656m v 1,875m. Bc sng ca vch quang ph th hai ca dy Banme lA. 0,286m B. 0,093m C. 0,486m D. 0,103m

4. Bc sng ca vch quang ph th hai trong dy Laiman l 0,103 m, bc sng ca vch quang ph th nht v th 2 trong dy Banme l 0,656 m v 0,486 m. Bc sng ca vch th 3 trong dy Laiman lA. 0,0224 m B. 0,4324 m C. 0,0976 m D. 0,3627 m

5. Bc sng ca vch quang ph th nht trong dy Laiman l 0,122 m, bc sng ca vch quang ph th nht v th 2 trong dy Banme l 0,656 m v 0,486 m. Bc sng ca vch u tin trong dy Pasen lA. 1,8754 m B. 1,3627 m. C. 0,9672 m D. 0,7645 m.

6. Bit bc sng ng vi hai vch u tin trong dy Laiman ca quang ph Hydro l 1 =0,122 m v 2 = 0,103 m. Bc sng ca vch H trong quang ph nhn thy ca nguyn t Hydro bngA. 0,46 m B. 0,625 m C. 0,66 m D. 0,76 m

7. Vch u tin ca dy Laiman v vch cui cng ca dy Banme trong quang ph hidr c bc sng 1=0,1218m v 2= 0,3653m. Nng lng ion ha ca nguyn t hidro khi trng thi c bn A. 3,6eV B. 26,2eV C. 13,6eV D. 10,4eV 8. Vch th hai ca dy Laiman c bc sng =0,1026 m.Cho bit nng lng cn thit ti thiu bt electron ra khi nguyn t hidr t trng thi c bn l 13,6eV. Bc sng ngn nht ca vch quang ph trong dy Pasen bng A. 0,482 m C. 0,725 m B. 0,832 m D.0,866 m 9. Cho gi tr cc mc nng lng ca nguyn t hir l E 1= -13,6eV; E2= -3,4 eV; E3= -1,5 eV. Cho h = 6,625.1034 Js; c = 3.108 m/s. Bc sng di nht ca bc x trong dy Laiman l: A. 0,12m B. 0,09m C. 0,65m D. 0,45m 10. Khi Hir trng thi c bn c kch thch ln trng thi c bn knh qu o tng ln 3 ln. Khi chuyn di v mc c bn th pht ra bc sng bc x c nng lng ln nht l: A. 0,103m . B. 0,203m . C. 0,13m . D. 0,23m