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[QUOTE=hemalathaijt;194745][B]Document Described : Mohan Lal Sukhadia University
Model Question Paper
M.Sc. (Semester-III) Physics Examination, 2011
Paper-I
(Atomic and Molecular Physics)
Time – Three hours
Max. marks- 75[/B]

SECTION-A (Short answer type questions)
This section consists of one question with ten sub-questions of one mark each. Answer each subquestion within 20 words.

SECTION-B (Long answer type questions)
This section consists of ten questions in all with two questions from each unit of 13 marks each. Attempt one question from each unit in about 400 words.

[B]Model Question List [/B]: [URL]http://mlsu.ac.in/model/M.Sc%20%28Sem%29.html[/URL]
[B]Model Question Paper[/B] : [URL]http://mlsu.ac.in/model/Model%20PDF/physics/III%20Semester%20M.Sc.%20Physics/Atomic%20and%20molecular%20Physics%20Paper%20I.pdf[/URL]

SECTION-A

UNIT-I
1. (a) What is equivalent electrons?
(b) State Pauli’s exclusion principle.

UNIT-II
(c) Define Bohr magneton.
(d)What is normal Zeeman effect?

UNIT-III
(e) What is the range of microwave frequency?
(f) Name the region in which pure rotational spectra lies?

UNIT-IV
(g) What is Raman effect?
(h)Under what condition does a molecule give rise to rotational spectra?

UNIT-V
(i)Define principal moment of inertia.
(j) What is ESR?

SECTION-B

UNIT-I
2. Explain the spectral series in hydrogen spectrum. How are the spectrum lines modified by considering the finite mass of the nucleus?
3. What is spin-orbit coupling? Explain L-S coupling taking the case of one and two active electrons.

UNIT-II
4. Discuss the theory of anomalous Zeeman effect and draw the energy level diagram for splitting of sodium D lines.
5. What are different types of line broadening? Explain Doppler broadening.

UNIT-III
6. Discuss the principle, working and use of microwave spectrometer.
7. Explain the theory of diatomic molecule as a vibrating rotator and find the expression for rotational constant.

UNIT-IV
8. What is Raman effect? Discuss the characteristics of Raman lines. What is the importance of Raman effect?
9. How Raman and I-R spectra are useful in determining the structure of a diatomic molecule?

UNIT-V
10. Write the salient features of molecular electronic spectra. Using Fortrat diagram explain P, Q and R branches in electronic transition of a diatomic molecule.
11. Discuss the theory of NMR spectroscopy. How it is useful in determining the structure of a molecule?[/QUOTE]

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