M.Sc. DEGREE EXAMINATION, APRIL/MAY 2018.
Second Semester
Physics
PHY 201 QUANTUM MECHANICS — II
2 20721-A
Time 3 Hours Max. Marks 70
SECTION — A
(Short Answer Type)
Answer any FIVE of the following. 6 30 Marks)
1. Explain the symmetric and antisymmetric wave functions.
2. Explain the oscillations and rotations of Hydrogen molecule.
3. Briefly explain variation technique.
4. Write a note on sudden and adiabatic perturbations.
5. Discuss briefly the scattering theory.
6. What is effective range in scattering theory? Explain.
7. Explain the inadequacies of Klein-Gordan equation.
8. Explain the concept of negative energy states.
SECTION — B
(Essay Answer Type)
Answer ALL questions. 10 40 Marks)
9. What are identical particles? Explain its indistinguishablity.
Or
Briefly explain Heitler-London method and discuss the concept of ortho
hydrogen.
10. Briefly explain the time independent perturbation theory.
Or
Discuss the WKB approximation method.

11. Discuss the method of partial waves in the scattering by a central potential.
Or
What is Born approximation and explain its validity.
12. Obtain the Klein-Gordon equation.
Or
Explain the Dirac matrices and discuss the theory of holes.
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