M.Sc. (Semester III) (CBCS) Examination Oct/Nov-2017
Physics (Material Science)
ATOMIC, MOLECULAR NUCLEAR PHYSICS
Day Date: Saturday,18-11-2017 Max. Marks: 70
Time: 02.30 PM to 05.00 PM
Instructions: Q.1 and Q.2 are compulsory.
All questions carry equal marks.
Figures to the right indicate full marks.
Use of non programmable calculator is allowed.
Q.1 Objectives questions:- 14
Select the correct alternatives: 06
Which of the following molecules does not exhibit a rotational
spectrum?
HCl CO
H2 HBr
The semi empirical mass formula for the binding energy of nucleus
contains a surface correction term. This term depends on the mass
number A of the nucleus as
A2/3
A1/3 A
The nuclear fission due to an absorption of a slow neutron is an
example of
Compound nuclear reaction Neutron scattering reaction
Direct reaction Quantum mechanical tunneling
Which of the following statements is true for a compound nuclear
reaction
The formation of the compound nucleus and its break up are
independent.
The break up of compound nucleus is instantaneous (very short life
time)
The break up compound nucleus depends on the channel of its
formation
The Q-value of compound nuclear reaction is always negative
The selection rule for a rotational transition is,
1 0
2 All of these
The Lande g factor single state is for 5F2 state
0 2
1 3
Q.1 Fill in the blanks: 04
According to the Lande' rule, the interval ratio 3F term is
The Scattering amplitude of n-p interaction is
The selection rules for the anharmonic oscillator are
If the motion is simple harmonic the force constant k is
Page 2 of 2
SLR-MO-527
Q.1 State true and false 04
Symmetric tops type of molecules have all moment of inertia IA ≠IB≠IC.
(True/False)
The selection rule for a rotational transition is 1. (True/False)
The electric quadrupole moment is negative; shape of the nuclei is
oblate.(True/False)
The shell model can explain magic numbers. (True/False)
Q.2 Write short notes:- 14
State and explain Franck-Condon principle. 05
Show that the excited states deuteron can not exist. 05
Derive the coulomb energy term of semi-empirical mass formula. 04
Q.3 Give the main assumption of liquid drop model of the nucleus. Obtain the
expression for the binding energy of a nucleus based on liquid drop model.
08
What was the need of various nuclear models? What are the basic
difference between liquid drop model and shell model of the nucleus?
06
Q.4 Discuss the effective range theory of low energy in n-p scattering. 08
Explain compound nucleus theory of nuclear reactions. 06
Q.5 What are the experimental characteristics of direct nuclear reactions? 08
Explain the theory of ground state of deuteron. 06
Q.6 Drive the expression for the allowed energy for diatomic non-rigid rotor. 08
Write note on rotation spectra of polyatomic molecules. 06
Q.7 Explain the coupling scheme for two valence electrons in brief and obtain
the expression for the interaction energy of jj-coupling.
08
Write note on born-oppenheimer approximation. 06