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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 (RR -Set 3 - Aug / Sep'2007- Sup) Question paper
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Code No: RR10103 Set No. 3
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 importance of coherent sources in interference phenomenon.
(b) Derive an expression for fringe width of bright fringes produced in Young’s
double slit experiment.
(c) A light source emits light of wavelength 5100 A.U. is exposed to a double slit.
A screen is placed at 2 meters from the slits. Find the distance between the
slits if overall separation of 10 fringes on the screen is 2 cm from its center.
[6+6+4]
2. (a) Differentiate between interference and diffraction.
(b) Explain Rayliegh’s criterion for resolving power of a telescope.
(c) A plane transmission grating having 6000 lines/cm is used to obtain a spec-
trum of light from a sodium lamp in the second order. Calculate the angular
separation between two sodium lines D1 and D2 of wavelengths 5890 A.U. and
5896 A.U. [6+6+4]
3. (a) What is meant by polarization of light?
(b) Describe an experiment that shows light is not propagated as longitudinal
waves.
(c) What is plane of vibration? [6+6+4]
4. (a) Explain the principle behind the functioning of an optical fibre.
(b) Derive an expression for acceptance angle for an optical fibre. How it is related
to numerical aperture?
(c) An optical fibre has a numerical aperture of 0.20 and a cladding refractive
index of 1.59. Find the acceptance angle for the fibre in water which has a
refractive index of 1.33. [4+8+4]
5. (a) What is Seebeck effect? How can it be utilized in thermometry?
(b) Define Seebeck, Peltier and Thomson Coefficients, and derive a relation be-
tween them. [6+10]
6. (a) How are the dielectric materials classified?
(b) Write short notes on “Glass”. [10+6]
7. (a) What is meant by hysteresis in magnetic materials?
(b) What are magnetic domains? Explain hysteresis basing on domain theory.
[8+8]
8. (a) Why is the airborne pressure vessels are required in aerospace?
(b) Explain the various properties of the materials used for airborne vessels along
with their salient feature.
(c) Why is the magnesium alloy is not used for the airborne vessels?
[6+8+2]
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