Jawaharlal Nehru Technological University Hyderabad 2006 B.E Computer Science applied physics - Question Paper

Code No: NR10201 NR
I B.Tech Supplementary Examinations, November/December 2005
APPLIED PHYSICS
(Common to Electrical & Electronic Engineering,Electronics &
Communication Engineering,Computer Science & Engineering,Electronics &
Instrumentation Engineering,BioMedical
Engineering,Information
Technology,Electronics & Control Engineering,Computer Science & Systems
Engineering,Electronics & Telematics and Electronics & Computer
Engineering)
Time: three hours Max Marks: 80
ans any 5 ques.
All ques. carry equal marks

1. (a) What is cohesive energy? Assuming a suitable model for interatonine
forces derive an expression for the cohesive energy.
(b) What is Madelung constant? compute its value for NaCl.
[10+6]
2. (a) elaborate Miller indices? How are they obtained?
(b) Derive an expression for the interplanar spacing ranging from 2 adjacent
planes of a cubic lattice.
(c) Sketch (100), (110) and (111) planes of a cuibic crystal.
[5+8+3]
3. (a) Derive Bragg’s legal regulations for Xray
diffraction in crystals.
(b) define Laue’s method for determination of crystal structure.
(c) A beam of Xrays
(? = 1A.U) is made to incident on a set of crystal planes
whose separation is five A.U. compute the angle for the 4th Bragg
reflection.
[6+6+4]
4. (a) Derive time independent Schrodinger wave formula for an electron.
(b) What is the physical significance of the wave function?
(c) Show that the energies of a particle in a potential box are quantized.
[8+4+4]
5. (a) discuss in detail the subsequent
i. Meissner effect and
ii. Penetration depth.
(b) elaborate hard and soft superconductors? discuss.
[10+6]
6. (a) discuss the terms
i. magnetic flux density
ii. magnetic field strength
iii. magnetization and
iv. magnetic susceptibility. How are they related to every other?Code No: NR10201 NR
(b) discuss the difference ranging from antiferromagnetism and ferrimagnetism.
[10+6]
7. (a) Derive the expressions for
i. acceptance angle and
ii. numerical aperture of an optical fiber.
(b) define various kinds of fibres by giving the refractive index profiles and
Propagation details.
[8+8]
8. Write short notes on the subsequent
(a) Line Imperfections of crystals
(b) KronigPenney
model.
(c) Electronic polarization
(d) HeNe
laser.
[4×4]

Earning:   Approval pending.