Loyola College B.Sc. Physics April 2009 Solid State Physics Question Paper PDF Download

         LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PHYSICS

XC 24

SIXTH SEMESTER – April 2009

PH 6606 – SOLID STATE PHYSICS

 

 

 

Date & Time: 21/04/2009 / 9:00 – 12:00  Dept. No.                                                     Max. : 100 Marks

 

 

PART A

Answer all questions.  All questions carry equal marks.                           (10 x 2 = 20 marks)

 

  1. Define coordination number.
  2. The lattice constant of a Cubic lattice is a, Calculate spacing between (0, 1, 1) and

(1, 1, 2) planes.

  1. Write Laue equations.
  2. The Bragg’s angle for (2, 2, 0) reflection from Nickel(f c c) is 45˚. when X-rays of

wavelength 1.75Å are employed in a diffraction experiment,.  What is the lattice constant?

  1. Mention any two assumptions of classical theory of specific heat of solids.
  2. State Gruneisen’s law.
  3. What is Hall effect?
  4. What do you understand by density of states?
  5. Distinguish between type I and type II semiconductors.
  6. What is Meissner effect?

 

PART B

Answer any four questions.                                                                         (4 x 7.5 = 30 marks)

 

  1. What are Miller indices? How are they determined?
  2. Write note is on Neutron diffraction.
  3. Debye temperature of carbon(diamond)structure is 1850K. Calculate the molar specific heat

for diamond at 20K.  Also compute the highest lattice frequency involved in the Debye

theory.

  1. Calculate the number of energy states available for the electrons in a cubical box of side 1 cm

lying below an energy of 1 electron volt.

  1. Explain I-V characteristics of d.c Josephson effect.

 

PART C

Answer any four questions.                                                                         (4 x 12.5 = 50 marks)

  1. Classify the seven systems crystal on the basis of 14 bravais lattices. Explain with the help of

the unit cell lattice parameters and giving examples.

  1. With a neat diagram explain the powder method for determining the structure of a crystal.
  2. Work out an expression for the specific heat of solids following Einstein model. Mention its

draw backs.

  1. a) Derive an expression for the Fermi energy of a free electron gas in three dimensions. (8)
  2. b) Estimate the lattice specific heat of sodium (at constant volume) at 20K. The Fermi

temperature of sodium is 3.8 x 104 K and its Debye temperature is 150 K.                   (4.5)

(K = 1.38 x 10-23 J/K)

  1. Outline qualitatively the BCS theory of superconductivity.

 

Go To Main page

 

 

Latest Govt Job & Exam Updates:

View Full List ...

© Copyright Entrance India - Engineering and Medical Entrance Exams in India | Website Maintained by Firewall Firm - IT Monteur