Iias{crn Univcrsityt)cpa rt lncn I ol' Ii I'. Ir

Scmcstcr: Spring 2()l INlirl-'l'crrn l'lr:uttilt:ttiott: ('rlttt'sc: l'}lty l(ll

I.'ull N'l:rrlis: J0

?. Caiculltc tlrc rrr.rrpircr 9l'rrrolccrtlcs irt oltc c.c. ol'ox1'ectt rt N'l P Lrsitlg tlrc givcn tlata:

Dcpsiti pl'rlcrcLrrv ,, 13.(r gpt/c.c.. Ill\,lS vclocitv ol'.oxy'1;cn tnt,lccttlcs a1 0"C ' 4.(t >r l0lclnlscc. \4ltss ttl'..,,," ,tr,.,lc.,tL ,,l'oxr uctt :i2 8 x l 0

r'l gm. 3

-' (' =,, /i. u ltct'c tlrc sr tttttols ltltvc tltcir Ll:lt-titl Ittclttritt:',s

A nrotttr cut'tirc has a;lrcsst-rrc of'2 rtttttosIltercs at tl:c r()otll tclrlpcl'tltllrc ol'27 "C. ll'tlrc

suclclurIv hLtrsts. llrtcl thc rcsttItitlu tctttpcrltl.ttrc'

-,,./Dcrit'c lrrr crprcssion lirl tlrc torli clone rlurittg itrt lttliabatic pr()ccss.

6.- -Dcclgc'L'

C I r9 si Lrs,a rr d (' !11c 1' rrr n cc1 tt rtt i o tt .

.7." Calctr latc tlrc clcprcssiorr irr thc rncltittg;loirrt ol'icc proclLlccd by ortc atrntlspltcrc

prcssllrc. (iivcrr. latcnt lrcat ol'icc '' [i() cal pcr grall artcl lhc spccitic volutrtcs ol'

lurrrl rr rrtcr llt 0 "(' ltt'c | 0() I crll' lttlcl I .0 cttlt. r'cspcclivcir

[)rovc thltt tltc tttclttt liirrctic cllcrq\Ir[rs()lrrtc tcnli)crattll'c tll a gls

ol'a rnolccttlc ol'I gls is tlircctlv proportiottal to thc5

(i

increasc ol'I grrr ol.icc

I rrc

)

/i-!

i.

Eastern UniversitYDepartmcnt of EEE

Scmcster: SPring 2011

Class Tcst - t; Course: PhY 101

FutI Marks: 15 Time: 40 Minutes

z{g*pluin first law of Therrnodynamics'/ // or-l' / proue that + =constant, where the symbols have their usual meanings.

f 1. Air is "o-pirr"d adiabai.;cally to half its volume. Calculate the change in its

temperature,r-:- ^^^^.^l t^,., ^f +Lom^.l.rnqmicq cnd entronv4. Explain second law of thermodynamics and entropy ' L-

5. pina trre efficiency of a carnot'i engine working between 127 'C and27 oc'

2

4

J

42

II:rstcrn UniversityFacultyofE&T

Ciass Test - IV; Semester _ Spring 2011;SLrlr.lccr: I,hysics (phy 101)

Irull Marks: l5: -l.imc:25 MinLrrcs

/': Dertne interfcrence of ligirt. what clo meant bl,trrc coherent sorrces? 3.5

.<t -.aJ' l'tnd out tlte conditions for constrLrctivc anci clcstructive interferences oiiight. 5

/y::::e cliflraction of light. Disting,ish bctween Fresner and Fraunhofer diffraction of

4

t Iictl li1lht ol'w'lvclctrgth 7500 A fiorn a nArrow slir is incidcnt on a double slit. II-thc/ ovcrail scpat'zttiotr ott 10 I'l'inges ()n a scrccn 2()o cm away is 2 cm. finci the slitseparation. '-J 2.5

Eastern UniversityFacultyofE&T

Class Test - III; Semester- Spring 20ll;Subject: Physics (Phy 101)

Full Marks: 15; Time: 25 Minutes

1. Distinguish between transverse and longitudinal waves.

f ^ wave traveling along a string is described by

y(x, t) : 0.0043 sin(77 .lx - 2.72t)

in which the numerical constants are in SI units.(a) What are the wavelength, period, and frequency of this wave?(b) What is the velocity of this wave?(c) What is the displacement y at x : 25 cm and t:20 sec? 3

/ m" maximum pressure variation that the ear can tolerate in loud sounds is about 40( N/m'. Normal atmospheric pressure is about 100,000 N/m2. Find the correspondingmaximum displacement for a sound wave in air having a frequency of 1200 Hi.(Given, the density of fluid : 1.22 kg/m3 and the speed of sound :i: t -/.;. 3

4. Define Doppler effect. Explain and proof Doppler effect. 6

7

Eastera UniversityFaculty of Engineering & Technology

Departr"rent of Electrical & F,Lectronic Engineering

B.Sc. Sirglneering Final Exam.ination, Spring 201iCourse Name: Physics I

Course i'do: PF{Y 10i Gr-2 (CI)

Ep ,,7 J-y . n'

F

Tctal Tirne: 2 hrs

Nts. 1. A;iswer a"^y 4 (iour) questions.

Full Marks: 40

find oin its soiutron.-/lpfProve that the total mechanical

zdissipative fo;ce acts on the system.

6) Define si:nple harmonic ii:.ction. Derive the equa;ion of simpie han:loric motion and

[05]energy is ccnserved fcr har^ncrric notion, if no

t05l

(a) Consider twc indepenCent simple harmonic csciilations having the Cisplacernenis x'and, y (at right angles to each cther). Draw the pictures of the resultant motions for

Ciffer;:at phases (fol both equal. and unequal amplitudes). t4.51rgv'l^ p?-jc't?;.e exocuies iineat nannonic rr.otion about the point x : 0; at t : 0 it has

€ispla;or:c:-rt X : A3i cn: an<j. zerc velocity. If the flequency of the.riptiot L_!.9-?51Sec,

dererm,ne (i) ths pe5iod, (rl) tne.C*isplacement at time t, (iii) the velocity at time.t, (iv) the

maxir:;un speei, (v) the ma:..-^inun acceleration, (.vi) the- displa-cement ai t: 3.0 sec, end

(vii) the velccity att:3.0 sec. r- I5.5f

3. (a) How the nodes and antincdes are forrneci in two waves? Explain. -

"'--""-*> [03](b)Wean9xpr9SSionforthepressuredisplacernentofsoundwaveS.=>kff'^" maxi:nu::: pi'essure ''rar:ation P thai the ear oan tolerate in lcuC sounCs is aboutt\;

N/i::2. Nix':::ril rii.i::,rspircrro prcssurc is r:boirt 100,0(X) N/m2. !iirld ilro oorrospolit!ing:-' niaximurn d:spiacsrnent ibr a sounC wavs i;r air having a liequency oi i2CC l-lz. (Given,

the d.ensity rf fl*to : 1 .22 kg/*' anc rhe speec of sound : 33\ m/s). [03]

-'"q.6Oefine inierference of iight. \r/hat Go you meant by coherent sources? [03]t j{*r-"t is fr:nge w:cth? Derive an expression for the fringe width. t04l- 6T*" ccherent souices are 0.2C m.m apart and the fringes are observed on a screen 100

&-";;;."i;it ;";;Jirr", *iti;1 ".nuin

n:o,ochromatic source of light, thejs-b.Ehtfringe is situateC at

"a distance of 1 t -r1rm rom the centry!-fltngq, Calculate the

wavelength of light. t04l

5. (a) Expiain tha drfiraction phenomena of light? Distinguish between Fresnel and

Fraunhifei ciiiiaction. [04]

(b) Expiain ihe ii;?acticn pl;:ct1ena using i:f*aclcn graol"ir:g. 103]

(tj f"p:*;n Brawste:'s la'".+fc: poiarization of light. L03l

r') - zn) DP- _a-