N A L A N D A O P E N U N I V E R S I T Y
M.Sc. Physics, Part-I
PAPER-VII
(Condensed Matter Physics)
Annual Examination, 2017
Time 3 Hours. Full Marks 80
Answer any Five Questions.
All questions carry equal marks.
1. Explain lattice, Bravais lattice, point group and space group. Show that the base centred and
the face centred tetragonal do not give any new Bravais lattice.
2. What is crystal defect Describe different types of point defects. Derive an equation relating
the number of vacancies found under equilibrium in a monoatomic crystal at a constant
temperature and the average energy required to create one vacancy.
3. Describe cellular method for studying the band structure of the solids. What are the problems
encountered in this method.
4. Discuss the quantization of electron orbits in a magnetic field.
5. What is a superconductor Explain how their properties differ from those of normal conductors.
6. What is quantum hall effect Give an account of the theory of this effect.
7. Give a qualitative description of the BCS theory (Bar deen, Cooper and Schrieffer theory). How
does it account fro the superconductivity
8. What are symmetry operations Describe the principal symmetry operation applicable to a
three dimensional lattice.
9. Write down the main characteristics of Fermi surface. Discuss the effects of the electric and
the magnetic fields on the Fermi surface.
10. Describe the powder method for X-ray diffraction. Discuss the formation of diffraction pattern
on the photographic film and its utility.