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Friday, July 29, 2016

NOU B.Sc Physics Condensed Matter Physics and Electronics 2015 Question Paper

Nalanda Open University
Annual Examination - 2015
B.Sc. Physics (Honours), Part-III
Paper-VIII (Condensed Matter Physics & Electronics)
Time: 3.00 Hrs. Full Marks: 80
Answer any five questions. All questions carry equal marks.
1. What is lattice energy? Calculate the lattice energy of an ionic crystal. Define Madlung constant and show that for an infinite line of ions, its value is 2loge2 (or 2 ln 2).
2. Deduce Laue's equation of diffraction of X-rays and obtain Bragg's diffraction condition from them.
3. Discuss Kronig-Penny model for energy band structure of solids. Distinguish clearly between a metal, a semi conductor and an insulator on the basis of energy bands in solids.
4. Distinguish between Einstein's theory and Debye's theory of specific heat of solids. Discuss Debye's theory and explain why this theory is most successful.
5. State and prove :
 (a) Superposition theorem and (b) Maximum power transfer theorem.
6. Define 'molar specific heat' (a) at constant pressure (b) at constant volume and the lattice heat capacity.
7. What is Zener diode? Explain its working and show with a neat diagram, its use as a voltage stabilizer.
8. What is an amplifier? Discuss the working of an R.C. coupled amplifier with a circuit diagram. Obtain expression for voltage gain.
9. Explain the principle of frequency modulation. Define frequency deviation and the modulation index for frequency modulated carrier.
10. What is photodiode? Discuss its working, characteristics and uses.

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