Pandit Ravishankar Shukla University 2010-Final Year B.Sc Physics Physcis s of of . - Question Paper

B. Sc. (Part III) EXAMINATION, 2010
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) discuss inertial and non-inertial frames of reference.

(b) Prove that in 2 inertial frames of reference which are connected through Galileon transformation, the legal regulations of conservation of energy remains invariant.

OR

(a) For relativistic velocities discuss the phenomenon of length contraction and also derive an expression for it.

(b) A clock indicates accurate time. What should be its velocity with respect to a static observer, so that it seems to be 30 seconds late in a day to him?

UNIT-2

2. (a) define Davisson-Germer experiment to prove the existence of matter waves.

(b) Prove that an electron having mass m and kinetic energy k produces a matter wave of wavelength ? = h/v2mk.

OR

(a) define the process of formation of wave packet.
(b) discuss teh wave velocity and group velocity and obtain relation ranging from them.

UNIT-3

3. Write short notes on the subsequent :

(a) Basic Postulates of Quantum Mechanics.
(b) Role of operators in Quantum Mechanics.

OR

Solve the radial part of Schrodinger formula for Hydrogen atom and also determine the maximum probable distance of electron from the nucleus of hydrogen.

UNIT-4

4. explain the spectra of alkali metals and discuss the fine structure of sodium D lines.

OR

define the molecular spectra and its discrete energy levels on the basis of the subsequent points :
(i) Electromagnetic Field
(ii) Quantization
(iii)Transition rules

UNIT-5

5. discuss a-decay with the help of Gamow theory.

OR

(a) explain the fundamental nature of nuclear forces on the basis of p-p and n-n scattering.

(b) provide an account of the interaction that takes place ranging from energetic charged and uncharged particles with matter. elaborate the applications of this interaction ?

Earning:   Approval pending.