Jawaharlal Nehru Technological University Anantapur 2012 B.Tech Electronics and Communications Engineering Sree vidyanikethan Engineering college 1st Engineering Physics - Question Paper

SREE VIDYANIKETHAN ENGINEERING COLLEGE
Max Marks:70
ans any 5 ques.
All ques. carry equal marks


1.(a) discuss and deduce Braggs legal regulations in X-ray diffraction. provide an account of powder method of crystal structure?
(b) In a crystal whose primitives are 1.2A*, 1.8A* and 2.0 A*. A plane (2 three 1) cuts an intercept 1.2A* on X-axis.
obtain the corresponding intercepts on the Y and Z-axes?

2.(a) explain on the Kronig-Penny model for the motion of electron in a periodic potential?
(b) How does the band theory of solids lead to the classification of solids into conductors, semiconductors and
insulators?

3.(a) What is a semiconductor? discuss p-type and n-type extrinsic semiconductors?
(b) With suitable examples, exlpain the direct and indirect band gap semiconductors?

4.(a) Write on piezoelectricity and its applications?
(b) what are on various kinds of magnetic materials?

5.(a) elaborate the basic requirements of an accoustically good hall?
(b) Write briefly on Sabines formula and its importance in architectural accoustics?

6.(a) discuss Ruy Laser?
(b) The Superconducting transition temperature of Tin is 3.7 K. Its critical magnetic field at O K is 0.03 Tesla.
What is the critical magnetic field at 2.5 K?

7.(a) discuss the phenomenon of total internal reflection?
(b) What is meant by Numerical aperture? discuss its significance?
(c) Mention a few applications of Holography?

8.(a) what are briefly on nanomaterials, and their applications?
(b) define any 1 method of fabrication of nano materials?

Earning:   Approval pending.