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$cffierial
B)
irAi6rygnetic
material
C)
material
D)
antiffimagnetic
material
C)1i@foendent
oftemperature
D)
none
oftheffi-{-rn
d
:ffi;#ifi:Jii
B]::lflilymetre2
'
='=*H
_
-I{O
The
electric susceptibility
1:
""
,,,,1'
..,
P F tr c.P
,Jry",
A) e'EP
u)
.,
,
q
i=
D)
H /
_{*:
b.
Describe the
different
polarization
mechanism. (0s
M4r)
"
**.ffi
*
c. Explain
hysteresis of
ferroelectrics.
(05
Mari[$.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
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--/
,,,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
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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
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