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Posted Date: 24 May 2009 Posted By: vivek Member Level: Gold
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2003 Jawaharlal Nehru Technological University, Hyderabad Production I B.Tech. Supplementary Examinations, November-2003 ENGINEERING PHYSICS Question paper
Code No.NR-10153
I B.Tech. Supplementary Examinations, November-2003
ENGINEERING PHYSICS
(Common to Civil Engineering, Mechanical Engineering, Aeronautical Engineering, Chemical Engineering, Production Engineering, Mechatronics Metallurgy and Material Technology)
Time: 3 hours Max.Marks: 80
Answer any FIVE questions
All questions carry equal marks
---
1.a) What is simple harmonic motion? Explain.
b) Write the theory of forced vibrations, and obtain the condition for amplitude resonance.
c) A body oscillates with simple harmonic motion according to the equation,
x = 8 cos [3?t+(?/3)] metres. What is (i) the displacement (ii) the velocity
(iii) the acceleration at the time t = 2 sec.
2.a) Describe the experimental procedure to find the radius of curvature of a
plano-convex lens by forming Newton’s rings.
b) Explain various methods to produce plane polarized light.
3.a) Describe in detail and explain spontaneous and stimulated emission of light.
b) Describe and explain the working of a Ruby laser.
c) Describe a method of determining the numerical aperture of an optical fiber.
4.a) Derive Bragg’s law for X-ray diffraction in crystals.
b) When a beam of X-rays of wavelength 1.8 A.U., is incident on a crystal surface, the second order maximum is obtained at a glancing angle of 15o. Calculate the corresponding inter-planar spacing.
c) Sketch the planes with Miller indices (123) and (221) in the case of a simple cubic crystal.
5.a) Discuss with suitable mathematical expressions, the Kronig Penney model for the energies of an electron in a metal.
b) Discuss the effect of a magnetic field on a super-conductor.
6.a) Explain the origin of spontaneous magnetization in ferro-magnets on the basis of spin-spin interaction. Explain magnetization curve on the basis of domain movement.
b) Determine the electric field intensity E in a material for which the electric susceptibility is 3.5 and the electric polarization is 2.3 ? 107 c/sq.m.
7.a) Explain in detail, the terms (i) dielectric constant (ii) dielectric loss and
(iii) dielectric strength.
b) Distinguish between Ferro-electrics and Piezo-electrics.
8. Write short notes on any THREE of the following:
(a) Colours of thin films
(b) Brewster’s law
(c) Hall effect
(d) Drude-Lorenz theory of electrical conduction
(e) Seebeck effect and Peltier effect.
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