Nalanda Open University
Annual Examination 2016
B.Sc. Physics (Honours), Part-I
Paper-I
Time: 3.00 Hrs. Full Marks: 80
Answer any Five questions, selecting at least one from each group. All questions carry equal marks.
Group A
1. Explain devergence of a vector. State and prove Gauss divergnece theorem.
2. State the Kepler's laws of planetary motion. On the basisi of inverse square law of
gravitation deduce these laws.
3. Derive Rutherford scattering formula for the differential scattering cross-saction for
particles in the inverse square law of force field.
4. Explain the variational principle of least action. On its basis derive Lagrange's
equations of motion.
5. Show the position co-ordinates in Cartesian and spherical polar Co-ordinate systems.
Give the infinitacimal volume element in both the systems.
Group B
6. With the help of neat diagrams, give the theory of Michelson-Morley experiment.
Explain the result of the experiment.
7. Deduce the equation of variation of mass of a particle with its valocity and hence show
that E=mc2
8. On the basis of the special theory of relativity discuss Length contraction and
time-dilation.
Group C
9. What is damped motion? Discus the theory of this motion with special ease of overdamped
motion.
10. What are Ultrasonic waves? Give a brief account of their production and uses in
practical life.