M.Sc. Physics (Materials Science) (Semester III)
(CBCS) Examination, 2017
ATOMIC, MOLECULAR NUCLEAR PHYSICS
Day Date: Thursday, 20-04-2017 Max. Marks: 70
Time: 2:30 PM to 05.00 PM
N.B. Attempt five questions.
Q. and Q. are compulsory.
Attempt any three from Q. No. to Q. No.
Figures to the right indicate full marks.
Use of non programmable calculator is allowed.
Q.1 Choose correct alternative: 06
The maximum number of electron in a sub shell with orbital
quantum number is

2 In case of jj Coupling spin of each electron is quantized with
respect to to form a resultant ji.
Another electron's
Its own
Another electron's
Its own
3 If the motion is simple harmonic the force constant is given by



4 The nuclear fission due to an absorption of a slow neutron is
an example of
Compound nuclear reaction
Direct reaction
Neutron scattering reaction
Quantum mechanical tunneling
5 According to the shell model of the nucleus which is incorrect?
Magic number exist
Nucleons interact with their nearest neighbours only
Nucleons in a nucleus interact with a general force field.
Large electronic quadruple moment exists for certain
nuclei.
6 The Scattering amplitude of n-p interaction is


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Fill in the blanks. 04
For an atom in the state of 2D5/2 the Lande factor should be

Selection rule for the harmonic oscillator undergoing
vibrational changes are
Transition rule for the vibrational- rotational spectra are
If Q value of nuclear reaction is positive the reaction is
State the following sentence are True or False: 04
Pauli exclusion principle state that no two electrons in the
same atom can have all of their quantum numbers the
different.
H2O is an example of symmetric molecule.
The electric quadrupole moment is positive; shape of the
nuclei is oblate.
In case of LS coupling; the triplet interval follows the Lande
Interval Rule.
Q.2 Answer in brief (any
What are the direct and indirect reactions? 04
Discuss the spectrum given by linear polyatomic molecule. 04
What are characteristics of n-p interaction at high energy. 05
Write down the value of quantum number and for a d-electron
and enumerate for it the possible values of the quantum numbers
and
05
Q.3 Show that for low energy n-p scattering
where the
symbols have usual meaning.
10
Explain linear and symmetric top of molecules. 04
Q.4 Obtain an expression for the allowed energy for diatomic non-rigid
rotor.
08
Discuss the nuclear reaction kinematics. 06
Q.5 Explain the compound nuclear reaction process in details. 10
Shows that deuteron cannot exists in excited state. 04
Q.6 Obtain the expression of Lande splitting factor for LS and JJ
coupling.
10
Discuss p-p scattering at high energy. 04
Q.7 Discuss the effective range theory of low energy in np scattering. 10
State and explain Pauli exclusion principle. 04