M.Sc. DEGREE EXAMINATION, APRIL 2017
Fourth Semester
Physics
CONDENSED MATTER PHYSICS
(CBCS 2013 onwards)
Time 3 Hours Maximum 75 Marks
Section A (10 x 2 20)
Answer all questions.
All questions carry equal marks.
1. "A lattice combined with a basis generates the crystal
structure" Comment on the statement.
2. What is the effective no of lattice points in a primitive
unit cell and a non-primitive cell?
3. "The effective mass of an electron becomes positive,
negative and infinity" Comment on the statement.
4. What do you understand from Bloch's theorem?
5. Explain the term polarization catastrophe.
6. What are piezoelectric crystals?
7. What are hard and soft magnetic materials?
8. Mention some of the properties of diamagnetic materials.
9. Mention a few line about high temperature super
conductors.
10. What is London penetration depth?
Sub. Code
521401
RW-178
2
Ws8
Section B x 5 25)
Answer all questions choosing or
11. Determine the relationship between the lattice
parameter and the atomic radius for
monoatomic sc, bcc and fcc structure.
Or
What is Bravais lattice? Explain Bravais lattices.
12. State and prove Bloch theorem.
Or
Discuss "Free electro gas" in 3D.
13. Describe the characteristic properties of
ferroelectric materials.
Or
Deduce the percentage of ionic polarizability in the
sodium chloride crystal which has the optical index
of refraction of 1.5 with dielectric constant 1.6.
14. What are ferrites? Give some of the application of
ferrites.
Or
Explain briefly Weiss theory of ferromagnetism.
15. Discuss phase transistion in super conductors.
Or
Give a short account of
Meissner effect.
Josephson effect.
RW-178
3
Ws8
Section C x 10 30)
Answer any three questions.
16. State the properties of a reciprocal lattice. Prove that fcc
lattice is reciprocal to the bcc lattice.
17. Discuss the formation of allowed and forbidden energy
bands on the basis of Kronig-penny model. Does the effect
change the Binding energy of the electron on the energy
band?
18. Discuss different types of polarizability with some specific
examples.
19. Explain the Langevein's theory of Paramagnetism.
20. Discuss Type I and Type II super conductors.