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Posted By: Sriram Member Level: Diamond Posted Date: 04 Sep 2008
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2008 Andhra Pradesh State Jawaharlal Nehru Technological University B.Tech ENGINEERING PHYSICS Set No. 4 Question paper
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Code No: R05010103 Set No. 4
I B.Tech Supplimentary Examinations, February 2008
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 why different colors are exhibited by a thin film when exposed to
white light.
(b) Write the necessary theory to determine the radius of curvature of a lens using
Newton’s rings method.
(c) In Young’s double slit experiment the separation of slits is 1.9 mm and the
fringe spacing is 0.31 mm. The screen is placed at a distance of 1 m from the
slits. Find the wavelength of the light? [6+6+4]
2. (a) Distinguish between polarized and unpolarized lights.
(b) What is Brewster’s law? Explain how this can be used to find the polarizing
angles of various crystals.
(c) Find the Brewster angle for a glass slab (µ =1.5) immersed in water (µ =4/3).
[4+8+4]
3. (a) Derive Sabine’s formula for reverberation time.
(b) Define the term coefficient of absorption and write short notes on it.
(c) A hall has dimensions 20 × 15 × 5 m3. The reverberation time is 3.5 sec.
Calculate the total absorption of its surfaces and the average absorption coef-
ficient. [6+6+4]
4. (a) Describe the principle, construction and working of a semiconductor laser.
(b) Write the applications of laser. [10+6]
5. (a) Derive expressions for the numerical aperture and the fractional index change
of an optical fibre.
(b) Write a note on the applications of optical fibres.
(c) Calculate the fractional index change for a given optical fibre if the refractive
indices of the core and the cladding are 1.563 and 1.498 respectively.[8+4+4]
6. (a) Explain how the magnetic materials are classified from the atomic point of
view.
(b) What are the differences between hard and soft magnetic materials.
(c) A magnetic material has a magnetization of 3300 ampere / m and flux density
of 0.0044 wb / m2. Calculate the magnetizing force and the relative perme-
ability of the material. [6+6+4]
1 of 2
Code No: R05010103 Set No. 4
7. (a) Sketch the following planes of a cubic unit cell: (001), (120) and (¯211).
(b) Explain Bragg’s law of X-ray diffraction.
(c) Describe Laue’s method for determination of crystal structure. [3+5+8]
8. (a) Explain Schottky and Frenkel defects with the help of suitable figures.
(b) Explain the significance of Burgers vector. [10+6]
2 of 2
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