DISTANCE EDUCATION
M.Sc. (Physics) DEGREE EXAMINATION, DECEMBER 2017.
SOLID STATE PHYSICS
(2008 onwards)
Time Three hours Maximum 100 marks
Answer any FIVE questions. x 20 100)
1. Discuss sodium chloride structure and Cubic zinc
sulphide structure with a neat diagram.
Explain the Fourier analysis of the basis. Write a
note on the structure factor of bcc lattice.
Write a note on quasi crystals.
2. Give an account of inert gas crystals. Also describe
the Vander Waals London interaction.
Write a note on atomic and ionic radii.
Describe the nature of elastic waves simple cubic
crystals. Explain their propagation in the
direction.
3. Write a note on
Quantization of elastic waves
phonon momentum.
Give an account of Einstein's theory of specific heat.
Mention its limitations.
What is umklapp process?
Sub. Code
23
DE-2958
2
WK 16
4. Drive an expression for heat capacity of an electron
gas.
State the Bloch theorem.
Explain the Kronig- Penney model in discussing the
behaviour of electronic potential.
5. Derive an expression for the concentration of
intrinsic carriers in terms of the band gap.
Explain briefly de Haas-Van Aiphen effect.
Write a note on the Fermi surface of copper.
6. Define dielectric constant and polarizability.
Define electronic polarizability. Discuss classical
theory of electronic polarizability and find the
frequency dependence of the electronic
polarizability of an electron having the resonance
frequency treating the system as a simple
harmonic oscillator.
Discuss Landau theory of the phase transition in
detail.
7. What is paramagnetism. Discuss in detail quantum
theory of paramagnetism.
Derive an expression for paramagnetic
susceptibility of conduction electrons.
Write a note on crystal field splitting.
8. Derive Bloch T3/2 law for thermally excited
magnons.
Write a note on ferromagnetic order.
Derive the dispersion relation for magnons in an
antiferrornagnet.