M.Sc. (Semester (CBCS) Examination Nov/Dec-2018
Physics (Solid State)
CONDENSED MATTER PHYSICS
Time: 2½ Hours Max. Marks: 70
Instructions: All questions are compulsory.
All questions carry equal marks.
Q.1 Multiple choice questions. 14
metals are generally not superconductors
Divalent Monovalent
Trivalent A and b
In HCP lattice are equal.
c γ
l None of these
In case of p type semiconductor, Fermi level lies at
Below near to conductor band
Above near to valence band
Below near to valence band
At the middle of valence and conduction band
In case of superconductor, at Tc conductance become
Zero Finite
Infinite None of the above
Intrinsic concentration of charge carries in a semiconductor varies as
T T2
T3/2 1 T
The effective mass of localized electron depends on
(d2E dK) dE dK)
(d2E d2K) (d2E dK2)
Brillouin zones are represented on
TP EK
HI EH
Energy gap of superconductor become zero at
0 K T c
H c a and b
have negative temperature coefficient of resistance.
Metal Semiconductor
Insulator Dielectric
10) N and P type semiconductor have same
conductivity resistivity
penetration thermoelectric power
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SLR-VX-550
11) According to mass action law, product of hole and electron concentration is
equal to of intrinsic concentration.
Square 1 2
1 3 1/4
12) At temperature materials shows transition from normal to
superconducting state.
Debye's Curie
Transition Critical
13) Superconductor are
Ferromagnetic Antiferromagnetic
Diamagnetic a and c
14) Coordination number of HCP is
Two Four
Six Eight
Q.2 Attempt the following (any Four) 08
Concept of cooper pair
What is superconductor?
What is electronic polarization?
What is rectification?
What is penetration depth?
Write note on (Any Two) 06
Brillion zones
BCC crystal structure
Write London equation
Q.3 Answer the following (Any Two) 08
Explain Dc Josephson's effect.
Derive the rectifier equation
Write about Ionic polarization
Answer the following (Any One) 06
Write the expression for penetration depth.
Write about Schottky barrier
Q.4 Answer the following (Any Two) 10
Explain in Brillouin zones in 2-D.
Write note on dielectric Breakdown.
Comment on number of possible energy states in a band
Answer the following (Any One) 04
Draw energy band diagram for no bias, forward bias and Reverse bias pn
junction.
Draw the Fermi surfaces of Brillion's zones.
Q.5 Answer the following (Any Two) 14
Give the expression for electronic polarizability.
Write about BCS theory of superconductor.
Give the expression for concentration of electrons in conduction band of
Intrinsic semiconductor.