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Posted By: Jose Mathew Member Level: Platinum Posted Date: 15 Aug 2007
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2007 Anna University B.E Engineering Physics Question paper
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ANNA UNIVERSITY B.E./B.Tech. DEGREE EXAMINATION, MAY/JUNE 2007
Annual Pattern – First Year
(Regulation 2004)
Aeronautical Engineering
PH IX01-ENGINEERING PHYSICS
(Common to All Branches)
Time : Three hours Maximum : 100 marks
Answer ALL questions.
PART A—(10 X 2 = 20 marks)
1. Define (a) Magnetostriction effect and (b) Piezo - Electric effect.
2. Write a note on SONAR.
3. What is known as Numerical aperture?
4. Differentiate between active and passive fiber-optic sensors
5. Define Wiedmann-Franz Law.
6. Outline the drawbacks of classical free electron theory.
7. Define Fermi energy.
8. The resistivity of an intrinsic semiconductor is 4.5 ohm-m at 200 C and 2.0 ohm-m at 320Cfind the energy band gap in eV. (Boltzmann constant = 8.67 x 10 -5 eV/K)
9. Write a note on Nano materials.
10. Write a note on Bio-materials.
PART B- (5 X 16 = 80 marks)
11. (a) (i) Define reverberation time. (2)
(ii) Derive Sabine’s formula for the reverberation time. (14)
Or
(b) (i) Define Packing factor. (2)
(ii) Deduce the c/a ration and packing factor for HCP structure. (10)
(iii) Calculate the inter-planar spacing for (101) and (221)planes in a simple cubic lattice whose lattice
Constant is 0.42 nm.
(4)
12. (a) (i) Explain how the wavelength of monochromatic source of light can be experimentally determined using a Michelson’s Interferometer. (8)
(ii) Distinguish between (1) circularly polarized light and unpolarised light and (2) elliptically polarized and
paretially polarized light. (8)
Or
(b) (i) Explain the lasing schemes and working of a Nd: YAG laser. (8)
(ii) Explain the construction and working of a Co2 Laser. (8)
13. (a) (i) Define Compton effect.
(ii) Derive an expression for the wavelength of the scattered photon (Compton shift) (10)
(iii) Find the change in wavelength of an X-ray photon when it is scattered through an angle of 1350 by free
Electron. (4)
(h= 6.63 x 10-34 J –s; m0 = 9.1 x 10-31 kg; C= 3x 108 m/s)
Or
(b) Derive an expression for the density of energy states and carrier concentration in a solid material(Metal) by using the Fermi distribution function. (16)
14 (a) (i) Define Hall Effect. (2)
(ii) Explain in detail how Hall coefficient can be determined experimentally. (10 )
(iii) The donor density of an n-type germanium sample is 1021/m3 .. The sample is arranged in a Hall
Experiment having magnetic field of 0.5 tesla and the current density is 500 Ampere/m2. Find the Hall
voltage if the sample is 3 mm wide. (4)
Or
(b) Write a note on:
(i) Meissner Effect. (4)
(ii) Type I and type II Superconductors. (4)
(iii) High Tc Superconductors. (4)
(iv) Apllications of superconductors. (4)
15. (a) Derive an expression for Internal field and deduce the clausius Mosotti equation. (16)
Or
(b) (i) Write a note on Liquid Penetrant method of NDT. (4)
(ii) Explain in detail the Ultrasonic method of flaw detection with a suitable experimental system (block
diagram). (12)
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