M.Sc. DEGREE EXAMINATION, APRIL/MAY 2018.
Second Semester
Physics
ATOMIC AND MOLECULAR PHYSICS
2 20724 A
Time 3 Hours Max. Marks 70
SECTION — A
(Short Answer Type)
Answer any FIVE of the following. 6 30 Marks)
1. Explain the determination of lead in petrol by flame emission spectroscopy.
2. Explain the line spectra of ions.
3. Discuss the vibrations of a molecule.
4. Write a note on dissociation energy.
5. Briefly explain the working of monochromator.
6. Explain the evaluation of absorptivity.
7. Discuss the vibrations of poly atomic molecules.
8. Explain the differences between Raman and IR spectroscopy.
SECTION — B
(Essay Answer Type)
Answer ALL questions. 10 40 Marks)
9. With a neat sketch explain the working of Atomic absorption spectrometer.
Or
Explain the identification of elements present in inorganic samples using
constant deviation spectrometer.

10. Explain Born approximation in molecular spectra.
Or
State and explain Frank-Condon principle.
11. Discuss the principle and instrumentation of non-recording single
spectrophotometer.
Or
Discuss in detail the identification of structure of simple organic compounds
by using visible spectroscopy.
12. Explain the theory of IR spectroscopy.
Or
Explain the Raman spectra of SO2 by using Laser Raman spectrometer.