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Type of Announcement : Model Question paper Physics - II
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Time: 3 Hours Max Marks: 100
Note: Attempt five questions in all. First question is compulsory select one question from each section. All questions carry equal marks.

Section A
Q.1. a) Define translation vector and co-ordination number.
b) What is Bragg’s law? Write down the statement of Bragg’s law.
c) The de-Broglie wavelength of an electron is 73 A0. What is its velocity?
d) What do you understand by Fermi energy?
e) What are the nano material?
f) What is Hall Effect? Explain briefly.
g) What are Brillouin zones?
h) Define photoconductivity.
i) Discuss the domain structure in ferromagnetic material.
j) Why does an atom show magnetic dipole moment?

Section B
1. What are Schottky defect and Frankel defect in solid? Derive the expression to show that Schottky defect in ionic crystal depends on temperature.
2. Explain the group velocity and phase velocity. Derive the expression for group velocity with which a wave group travels.
3. Derive the expression for electrical conductivity of metals on the basis of Drude Lorentz theory.

Section C
1. Discuss the phenomenon of thermionic emission in metals. Obtain Richardson Dashmann equation for the emission of current density
2. What do you mean by Nanotechnology and its applications? Define Quantum size effect.
3. What are Traps? Discuss a simple model to show the effect of traps on the photoconductivity and give the applications of photoconductivity

Section D
1. Give classical theory of paramagnetism and explain curie law and curie Weiss law.
2. Discuss classical theory of paramagnetic and explain the effect of temperature on paramagnetic properties of a material.

More questions download here : http://www.riet.in/images/Mdel_paper...%20physics.pdf