Engineering Physics July 2014 - 2010 Scheme

8/9/2019 Engineering Physics July 2014 - 2010 Scheme

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USN

L0PIJYt2l22

ry 2014

irst/Second

Semester

B.E.

Degree

Exam

Engineering

Phys

Time: 3 hrs.

yJryz

Max.

Marks:

loo

,

"'+n,if

iffi"t

l.

An;swer

any

FIVE

fult

questions,

choosing at

least

two

from

each

part

_,,=

'5

-

*

"

,'1=d

2.

Answer all

objective

gtpe

questions

only in OMR

sheet

page

5

of the

answeq'$imklet.

oj

*j."'],.Answer

to

objective

fitpe

questions

on

sheets

other

than OMR

will

not be"valuid.

€

iillj.:iiyrrcol

constants

: Velocity

of light,

c:3

x

tTs

m/s

fd*i='

e

-s

.,.,:i';:r'...

Planck's constant,

h:6.625x

1tr34J.5-

,"''-,'-

,;=

cS

E

'".'':i,*

Charge

on

electrofl,

€

:

1.602

x 7trIsc

".

'=l

*

€

"

Mass of electron,

m:9.1

x

lT3tkg--

r,,:'

r"e

g

/,,^--,r-^-,,*hnr N.:Ao)vltlzo/t

s

i,,..,,-

Avagadro

number,

Ne:6.02

x trt6*

W[e

"

g

peimittivtty

of vacuum,

€0:8.85

x ti'2F/*

EP

S=

Boltunann

constant,

k: 1.i8 x

lT23ilk-

Q:=

':lzr#

-E

e '-'l

PART

-

A

*B:: I a.

Choose the correct anfus

for the

following

: \r"r,

(04

Marks)

H

+

I a.

Uhoose the correct

ans\I$,rs

ror tne

ro[owmg :

.E

$ D

If

an

electron,

protdffiqeutron

and cr

-

-"%ge

EE A)- -

ny4;.. cy

h

p)=2h

6

E

ffioe

'

nk-e 2moe

3moe

E

f

:::\

'r.L^

-L^+^^r^^+;^

^sc^^A;-

Ati-^*.,^,{

^-l*,:i{+L^,,,^.,olonnrh

^f

li-hf ic

gr

+

I a.

\-iluoss

rrrs

uu[rsu[

auslxFl.ii

_rur

rrs

rurruwrlrB .

't1#

_(ur

lYrarnv

=

$ D

If

an

electron,

protdffiqeutron

and o

-

partiCfe have

the

same

velocity,

the

particle

cg \r

E

g.

which

has

the largest wavplcngth

is

'

*r

S

E

A)

electron

n)

figtou_

:,,'";.=

C)

neutron

D) oc

- particle

I

E

ii)

The

Compton shift

for the

i

I

iir)

The

photoelectric

effec6{s ffi'served

on@* f$re wavelength

of

light is

g

e

A)

utor.

threshold

wgelength

-

B)

below

threshold wavelength

'o

o0

tr

A)

above

thresh<

T

E

C)

zero

,..n:.=.j

.

'D)

$ewl

to threshold

wavelength

E

E iv)

The

law

whic

iled

to

account

for

longeffiavelength

of

blackbody

radiation

P

;E

'.p":Jl-.',1

. *-

E

;

A)

Wein

p,p

B)

RaYftfgh-Jean's

law

f f

C) Plank's law

D) Maxwell's

law

"

S

b.

Describe-pdb.helectric

effect

along

with

Einstein's explanation.

(06

Marks)

;

g

c. Describp; visson and

Germer experiment

for confirmation of

de-Br.o,glle

hypothesis.

E

'E

+

"

(07

Marks)

3

cJ

enerqv

of an

electron of

wavelength

3

x

l0-3a,

F

E

d.

CalpFlate

the kinetic

energy

of an

electron

of

wavelength

18 nm

f"h.-46.6,

EE *ril.:9.11x10r'kg1.

'*(o3Marks)

-ts

{'-",

;

hoo

"'

'E

g

2

a.' Choose

the correct answers

for

the

following :

g

[

'

i) From the Heisenberg's uncertainty

relation, AL.AO

,-fi,L

refers to

ot

A) length

B) linear displacement

-i

i\i

-

C) angular displacement

D)

angular momentum

ii) The

first

excited

state energy

of a

particle

of

mass

m in

a

box of

width

'a' is

given

by

2

E

A \

-^-^

h2

^,

2h'

h\

h'

E

A)

zero

B)

^

,

C)

"._r

D)

"*^,

s

iii)

Wave function associated

with a

material

particle

is

A)

single

valued

B)

finite

C)

continuous

D)

all ofthese

If the uncertainty

in momentum is large,

the uncertainty

in energy is

C)

zero

1 of4

iv)

tco

/.s

A)

small

B)

large

D)

independent

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What is Heisenberg's uncertainty

principle?

Discuss its

significance.

(03

Marks)

An

excited atom

has an

average

life time of 10-8

seconds.

During this

period,

it

emits a

photon

and

returns to the

ground

state.

What is the minimum uncertainty in the frequency6f,

this

photon?

(04

MCrks)

1OPHY12t22

Obtain the

time

independent Schrodinger

wave equation

for

a

particle

in

one-dimensional

potential

well of

inf,rnite

height and

discuss the eigen values.

(09

Marks)

Choose the correct

answers

for the

following

:

D)

none of these

is

proportional

to

D) n'

The electron

ies in classical free electron

thmry follow

v)

b.

Explain the failures of

classfuEl*{ree

electron

ffig3y

(06

Marks)

c.

Explain

Fermi-energy and

Fefffaetor.

$

d.

Calculate

the

mobility and

relaxati

of

electron

in

copper assuming

that

each atom

contributes

one free electron

for

gffieflfuri.

Given resistivity

of

copper

:

1.73x

10-8

ohm-m.

At.

weight

:

63.5, density:

8.dl

'0'

td#,d$o

:

6.02

x

l026kgmole.

(04

Marks)

*'n* o,/

^

4 a.

Choose the correct

answers,Tei

the

following

:

*l*

,,,''

-.

'::l

j:l

i

3,

',,,-'

(04

Marks)

D

Copper

is "'...

"'

,,,

,

A)

IVlaxw_ell-Boltzmapn

statistics

B) Fermi-Dirac

statistics

C) Bose-Einstein

stml$$[cs

_

D]hone of these

Explainthe failures of

chsJ@e-e

electron qt"gey,

(06

Marks)

Explain

Fermi-energy and

Fe#frcLor.

D\hffiss

the

probability

of occupation of various

energy states by electron

at

T:0oKdtrF{

i

OdK

on the basis of Fermi

factor.

(06

Marks)

--rr-- -- \

"

A)

diamagne$cffierial

B)

irAi6rygnetic

material

C)

[email protected]

material

D)

antiffimagnetic

material

C)1i@foendent

oftemperature

D)

none

oftheffi-{-rn

d

:ffi;#ifi:Jii

B]::lflilymetre2

'

='=*H

_

-I{O

The

electric susceptibility

1:

""

,,,,1'

..,

P F tr c.P

,Jry",

A) e'EP

u)

.,

,

q

i=

D)

H /

_{*:

b.

Describe the

different

polarization

mechanism. (0s

M4r)

"

**.ffi

*

c. Explain

hysteresis of

ferroelectrics.

(05

Mari[$.16

:::i

d.

If a NaCl crystal

is

subjected

to an

electric

field of 1 KV/m

and

the

resulting

polarization

is

d

4.3

x

10-8

clri.

Calcrrlate the dielectric

constant

of NaC.[..

Ieo

:

8.85

x

10-r2

Fm-l1.(03 Marks)

ii) Electroniq

polarization

oi''

PART

_

B

5

a.

Choose the correct

answers

for the

following :

i)

The

life

time of

an atom on a

metastable state is

of the order

y",*..*".",.d..d.1

A)

inffis6s

with

temperature

B)

decreasedffih4emperature

C)tiidbpendent of

temperature

D)

none of

thesd*;'*

(04

Marks)

D)

few millisecond

,,,,,,..,,i)

The Fermi

temperafure

is given by

A)?8,

B)1&

c)-E..

3K

.2

K

K

.a:"

;/

ii)

='{.-}q(he

mobility of

an

electron

in a metal increases, the

resistivit

A) a

few seconds

B) unlimited

2

of4

C)

a

nano second







































































































































































































































































































































































































--/

,,,i1,,o,,,,,

A)

only amplitude

B) only

phase

."''.,,'.'.......

C)

both

amplitude

and

phase

D)

neither amplitude

nor

phase

rl

,' i i : I

iw\

Pumping

process

in a diode

laser is by

f

,

'#,,

A)

optical

pumping

B)

forward

bias C)

electric

discharge

D)

n

8{these

-

,},

\__

*&.

b.

-{l@plain

the construction

and

working

of

a

He-Ne

laser.

^**

=

t,*

(07

Marks)

c.

Exf.Ifin

the

principle of

holography

and

mention its applications.

. lU

(0s

Marks)

d.

Find'W::io

of

populations

of two

en:rgy

levels

in

a

laser

if the

g@ion

between

them

producei'.light

of wavelength

64934,

assuming

the ambiqhi'temperature

as 27"C.

[K:1.38

iffiiK1.

,*(i;"',,

(04Marks)

1

"

1{

^

1r,- r-rr- :---

-

\

6 a.

Choose the correctriapswers

for

the

following

:

-

'

8nhr3

B)

8nh;I'

C)

)"''c'

iii)

Holographyrecords

Choose the correffi$swers

for

the

tbllowing

: a*=\

(04

Marks)

D

If

the angle

of ihddence of

a

ray is

equal

to

the=critidal

angle

at

the interface

of

core

an

cladding, then

th6.@;travels

\n#

A) in the cladding

ii) The ratio of Einstein's coefficients

A and B is

A) 0.0769

B) 0.0J_.1.4-."" C)

r.0769

D)

0.9286

A

type

II

superconductor in dre

vorte4state show

A)

complete Meissner

p.ife4t'ind

zero

B)

incomplete

Mei

andzero

elffir.i

C) complete Meiss

effect

and

non-zero

e

)

incomplete

PIJY12l22

is

increased, the

(07

Marks)

ir)

A) in the cladding

'..{=

.

*'ru F)

in the

core

C)

along the

interface

r.

*

"'

D)

in the

bufl

)

along the

interface

r.

*

".''

D)

in the buffer

Fractional index change

Srffi_optiQ#

fibre of refractive

index

of

core

and cladding

1.68 and 1.56

is

A) 0.0769

B) 0.0J-.1:,4-."" C)

r.0769

D)

0.9286

) 0.0J-.1=4-."'' C)

1.0769

ior

ia'llqWonb4

state

show

'

plfegt'and

zero dU&trical

resistivity

iir)

iv)

Below

the cr

B) decreases

b. What is

att

ff,gliation?

Explain the various

mechanisms

through

Expl I and type-Il

superconductors.

Choose

the correct

answers

for

the

following

:

i)

A

crystal of hexagonal lattice

has unit cell

with

sides

md type-Il

superconductors.

(05

Marks)

aperture

of

an optical

fibre

is

0.2 when surrounded

by tii=lbdermine

the

RI

core,

given the

RI of

the cladding

is 1.59.

Also find

the

acceptance

angle

when the

is in water of RI 1.33.

{#o

Marks)

' 'a:

(0a3[prks)

[,

a.

\

+rL

\

,t

w'\:"

i

.&Jt"'

hili:"'h

L,

4t)a*b*c,cr+p+y+90o

C)

a*

b: c,

fl:

B

:120",

y:90o

ir)

A

plane

intercepts

at a,

),2c

in a

,2,

B) a: b:

c, ct

D)a:b*c,

u

simple cubic

unit cell.

120"

r'nri

:F:y:90"

:

F:90",

T:

plane

are

A)(2r4) B)(24t)

c)

(42

ii, The

coordination

number

in face centered cubic cell

1)

is

The miller

indices

of

the

D)(t24)

D)

12

)2 B)6

3

of4

c)8































































































































































































































































































































































































































10PHY

12t22

iv)

In the Bragg's equation,

2d sin 0

=

nl.

,

the angle 0 is

A) the angle between

the incident

beam and

the

diffracted X-raybeam.

B)

fhe

angle between

the incident beam and the normal to the

diffraction

planes

,

C) the angle between

the incident

beam and the

diffraction

planes

*fl .

D)

none of these.

q,,"

*m

b.

Define packing factor. Calculate

the

packing

factor

for

sc, bcc and fcc

structures.

(07

Mankg

*;= :.

Describe the construction

and

working of

a

Bragg's

X-ray

spectrometer.

tOr

ntnikO

"

$ffi

Draw the

following

planes in

a cubic

unit

cell:

..,

"---"

#g}:2

0 0)

i,

(,

1

0)

iii)

(1

3

2)

60s

tr{arks)

ij..:11

:l

-:;j,

...;:

....4-

8

a. Cffi

the correct

answers

for the

following

:

:\ s'#t$-l-

-L-1^^-

l^

-,-^

^f

rrrect answers

for the

following

:

+1.=

"**

(04

Marks)

nanofubes

are made

up

of

&.,

-'"

-

e :*'"

""s,d:9'-\ ^

a :ji

E

,ffiphene

B) mica

sheet

lffi"

C) ifficomb

D)

plastic

..*Y

.,-*1lri-bfu

ii) The

stWqf

matter

around the

nano-size

is known as

.IT....,

*

,.$)n$)

A) solid

itate,""

B)

liqu{dqtate

l,:{

^_

Y-+,

cjplasma *dr-.

Pinmsqscopic

state

i.:f

LH1Y.

ii

.,

-.-,*1*

lill

*u,"

iJj/

cszurnA.

\ ,r

iii)

;li:1.ufltff{,,"*

ora

riquid

is

character;LffiJoprc

state

{

*ilt#r}t,

A) Young's

moduldpfu

B).Kigidity modulus

'\|"\*,_/*),,

C)

Bulk

modulus

**#*.

Ultrasonic

waves are

piLdr$e$

I

A)

electromagnetic

inductiog"q

"

v[l4rvlllv vY4vvD srv

rrwvvg

uJ

"

\&ge

A)

electromagnetic

inductioffi",

_

".-,$

B)

electric tuning

fork

{fuD)

Poisson's ratio

iv)

liltrasonic

waves are

piLdse$

by

..

-M

C)

piezo

electric effect

"*J;[

D)

inverse piezo

electric effect

b.

Write a

note on fullerence.

What lications

of

fullerences.

(08

Marks)

c.

Explain

with

principle,

how the

using ultrasonics.

=3..

tn a

s$qcan

be detected

by non-destructive method

.',.

,.=

og Marks)

d<

tF ,f tF *

u**'""1

':

,+

':,.==

'.*aJ

f

ddd{Bf

w

l

ldd

'11"""""""t'

r-.Yf,t

Sann

-t"9,,

$l

\

,/J

-

'r,*

t

"e{l

_-s3

,#-

#h

-e*r*

".1,

a,

ts

d,

{

"

*. 1

-*ffi

4

of4
































































































































































































































































































Engineering Physics July 2014 - 2010 Scheme

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