Nalanda Open University
Annual Examination 2016
B.Sc. Physics (Subsidiary), Part-II
Paper-II
Time: 3.00 Hrs. Full Marks: 80
Answer any five questions. All questions carry equal marks.
1. Define electric intensity E

electric polarization P

and electric displacement D

and
establish a relation between them.
2. Distinguish between Para and ferro magnetism. Give Langeviw's theory of
paramagnetism.
3. Describe the Millikan's Oil Drop method of measurement of charge on an electron
using neat diagram and derive the necessary formula.
4. Explain Seeback effect, Pettier effect and Thomson's effect. Define Pettier Coefficient
and derive its expression. What is Thomson's coefficient?
5. What is photo electric effect? Derive Einstein's photoelectric equation. The photo
electric threshold for a certain metal is 300 nm. Determine the maxm energy of the
electron ejected by a radiation of 200 nm (Given that h 6.6 × 10-34 JS).
6. What is Compton effect? Prove the formula of wavelength shift cos
m c
h
0
in
Compton effect. Explain why Compton effect is not experimentally observed for visible
light.
7. Give the theory of Newton's rings and show how can it be used to find of sodium
light.
8. What are solid state Lasers? Discuss the construction and working of Ruby Laser.
9. State Brewster's Law. How will you change unpolarised light into plane polarised light
by reflection? What is double refraction?
10. Give an account of Bohr's theory of hydrogen atom.