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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 Engineering Physics (R05-Set 1 - Aug / Sep'2007- Sup) Question paper
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Code No: R05010103 Set No. 1
I B.Tech Supplimentary Examinations, Aug/Sep 2007
ENGINEERING PHYSICS
( Common to Civil Engineering, Mechanical Engineering, Chemical
Engineering, Mechatronics, Metallurgy & Material Technology, Production
Engineering, Aeronautical Engineering and Automobile Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
1. (a) Explain the principle of superposition of waves.
(b) Explain the phenomenon of interference.
(c) With relevant diagram explain Young’s experiment on the basis of wave theory.
[4+4+8]
2. (a) Explain how nicol prism acts as an analyzer.
(b) With necessary diagram explain elliptically polarized light.
(c) Calculate the thickness of quarter wave plate and half wave plate, given that
refractive indices of ordinary ray and extra-ordinary ray are 1.653 and 1.644
respectively. Wavelength of light used is 5400 A.U. [6+6+4]
3. (a) Explain how the reverberation time of hall is affected by
i. its size
ii. nature of its wall surfaces and
iii. audience
(b) Describe a method to measure the sound absorption co-efficient of a material.
(c) A hall of volume 1586m
3 is found to have reverberation time of 2 sec. If the
area of the sound absorbing surface be 650m
2, calculate the average absorption
co-effiencient. [6+6+4]
4. (a) With neat diagrams, describe the construction and action of Ruby laser.
(b) Write the applications of laser. [10+6]
5. (a) Write notes on:
i. fibre materials
ii. light sources for fibre optics
iii. photo-detectors for fibre optics.
(b) Explain the terms
i. numerical aperture and
ii. acceptance angle of a fibre.
Derive expressions for them. [6+10]
6. (a) What are paramagnetic and diamagnetic materials? Give examples.
(b) Discuss the temperature variation of susceptibilities in paramagnetic and dia-
magnetic materials. [10+6]
7. (a) Explain Bragg’s law of X-ray diffraction.
(b) Describe Laue’s method for determination of crystal structure.
(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. [6+6+4]
8. (a) Explain Schottky and Frenkel defects with the help of suitable figures.
(b) Derive an expression for the number of Schottky defects in equilibrium at a
temperature T.
(c) The fraction of vacancy sites in a metal is 1 ×10-10 at 500 0C. What will be
the fraction of vacancy sites at 1000 0C? [6+6+4]
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