Aligarh Muslim University (AMU) 2009 B.Sc Physics Atomic, Molecular, Laser and CondMatter - Question Paper
4294
2008-2009
B.Sc.(HONS.) (PART-III) EXAMINATION PHYSICS
ATOMIC, MOLECULAR, LASER AND SOLID STATE PHYSICS
(PH-309)
Maximum Marks: 40 Duration : Three Hours.
Answer all questions.
1 .(a) Discuss Paulis exclusion principle. Apply this principle to energy levels of
2'
equivalent electrons p . 05
(b) Explain Zeeman effect. How this effect can be observed? 02
OR
1 (a) Explain the fine structure of Hydrogen atom. Discuss the Lambs shift. 05
(b) Explain LS and j j couplings. Obtain the terms of pd configuration in LS
coupling scheme. 02
2.(a) Find the energy levels of a diatomic molecule as a rigid rotator. Explain the properties and applications of these rotational energy levels. 05
(b) Describe the infrared spectrum of a diatomic molecule. 02
OR
2(a) Describe Raman effect. Discuss the Rotational Raman spectra of diatomic
molecules. 05
(b) Explain the energy levels of a diatomic molecule as simple harmonic oscillator
model. 02
3.(a) Discuss spontaneous and stimulated emission. Explain population inversion.
Find the relation between Einstein coefficients Ajind B. 04
r---- ---------
(b) Describe the construction and working of He - Ne Laser. What are the advantages of this laser? Give the relevant energy level diagram. 03
-a-
4.(a) Discuss primitive cell, unit cell and Wigner-Seitz cell. Explain Brakes lattices. 05 (b) Explain the structure of NaCl crystal. 02
OR
-2-
4(a) Discuss the cohesion of atoms and primary bonds in the crystal. Explain
covalent and metallic bonds. 05
(b) Explain the structure of diamond crystal. 02
5.(a) Explain Braggs law of diffraction in crystal. Explain Laues experiment and
Laue photograph in crystal. 04
(b) Briefly explain the dispersion curve of a one- dimensional monatomic chain. 02
6. Describe the occurrence of the energy band gaps in solids. Outline the Kronig-Penny model and discuss it qualitatively. 06
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