Pandit Ravishankar Shukla University 2009 B.Sc Physics Pandit ravishankar university's of . - Question Paper

B. Sc. (Part III) EXAMINATION, 2009
PHYSICS
Paper First
(Relativity Quantum Mechanics, Atomic, Molecular and Nuclear Physics)

Time : 3 Hours] [Maximum Marks : 50

Note : Attempt 1 ques. from every Unit. All ques. carry equal marks.

UNIT-I

1. (a) explain the Michelson-Morley's experiment. (7)

(b) discuss negative outcomes of this experiment. (3)

OR

(a) Derive the Einstein's formula of mass-energy equivalence. (7)

(b) compute the energy released in eV when a neutron decays into an electron and a proton.
Where : (3)

mn = 1.6747 * 10-27 kg,
mp = 1.6725 * 10-27 kg,
me = 9.0 * 10-31 kg

UNIT-II

2. (a) What is Heisenberg's uncertainty principle ? (3)

(b) Verify the principle by Gamma-ray microscope experiment. (7)

OR

discuss why could the classical theory fail to discuss photoelectric effect and provide the Einstein's explanation of photoelectric effect. (10)

UNIT-III

3. (a) find expression for the energy of a free particle enclosed in a one-dimensional box.(6)

(b) discuss that eh energy levels of a particle in a box are discrete. (4)

OR

(a) Derive time dependent Schrodinger wave formula. (7)

(b) provide the physical interpretation of wave function. (3)

UNIT-IV

4. (a) What is Raman Effect ? (4)

(b) define the experimental arrangement to study it. (6)

OR

Write short notes on the subsequent : (each 5)

(i) Spectra of Hydrogen
(ii) Selection Rules.

UNIT-V

5. (a) elaborate nuclear detectors ? (2)

(b) discuss the construction and working of an ionisation chamber. (8)

OR

Write short notes on the subsequent : (each 5)

(i) Liquid-drop model

(ii) Nuclear fusion

Earning:   Approval pending.