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Posted By: India Member Level: Diamond Posted Date: 19 Jan 2008
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2007 Jawaharlal Nehru Technological University B.Tech I Year Applied Physics (R05-Set 4 - Aug / Sep'2007- Sup) Question paper
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Code No: R05010201 Set No. 4
I B.Tech Supplimentary Examinations, Aug/Sep 2007
APPLIED PHYSICS
( Common to Electrical & Electronic Engineering, Electronics &
Communication Engineering, Computer Science & Engineering, Electronics
& Instrumentation Engineering, Bio-Medical Engineering, Information
Technology, Electronics & Control Engineering, Computer Science &
Systems Engineering, Electronics & Telematics, Electronics & Computer
Engineering and Instrumentation & Control Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
1. (a) Explain the bonding in NaCl. [6]
(b) Calculate the bond energy for NaCl molecule. [6]
(c) Calculate the potential energy of the system of Na+ and Cl- ions when they
are 0.25 nm apart. [4]
2. (a) Explain Bragg’s law of X-ray diffraction. [6]
(b) Describe Laue’s method for determination of crystal structure. [6]
(c) A beam of X-rays is incident on a NaCl crystal with lattice spacing 0.282
nm. Calculate the wavelength of X-rays if the first order Bragg reflection
takes place at a glancing angle of 8o35'. Also calculate the maximum order of
diffraction possible. [4]
3. (a) Describe edge and screw dislocations. Draw Burgers circuit and slip planes
for them. [10]
(b) Explain the significance of Burgers vector. [6]
4. (a) What is Fermi level?
[2]
(b) Explain Fermi-Dirac distribution for electrons in a metal. Discuss its variation
with temperature. [8]
(c) Calculate the free electron concentration, mobility and drift velocity of elec-
trons in aluminum wire of length of 5 m and resistance 0.06 carrying a
current of 15 A, assuming that each aluminum atom contributes 3 free elec-
trons for conduction.
Given: Resistivity for aluminum = 2.7× 10-8 -m.
Atomic weight = 26.98
Density = 2.7 × 103 kg/ m3
Avagadro number = 6.025 × 1023 [6]
5. (a) Draw and explain B-H curve for a ferromagnetic material placed in a magnetic
field. [6]
(b) Discuss the theory of paramagnetism. [6]
(c) State the properties of diamagnetic materials. [4]
6. (a) Explain n-type and p-type semiconductors. Indicate on an energy level di-
agram the conduction and valence bands, donor and acceptor levels for an
intrinsic and extrinsic semiconductors. [10]
(b) Explain the detailed mechanism of current conduction in n and p type semi-
conductors. [6]
7. (a) What do you understand by population inversion? How it is achieved? [6]
(b) Derive the relation between the probabilities of spontaneous emission and
stimulated emission in terms of Einstein’s coefficients. [10]
8. (a) Explain the difference between a step-index fibre and graded index fibre. [6]
(b) What are the advantages of an optical fibre communication system over the
conventional ones? [6]
(c) A fibre has the core and cladding refractive indices 1.45 and 1.44 respectively.
Find the relative refractive index difference. [4]
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