Download OU B-Tech First Year 2013 June 2004 Engineering Physics Question Paper

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Note: Answer all questions from Part A. Answer any five questions from Part B.
PART ? A (25 Marks)
1. What are the basic principles of Holography?
(2)
2. If the diameter of two consecutive Newton's rings in reflected light of wave length

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5890 A
?
are 2.0 and 2.02 cms respectively. Calculate the radius of curvature of the
lens.
(2)

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3. Obtain Rayleigh-Jeans law and Wein's law from Planck's law. (2)
4. Define pointing vector.
(2)
5. Calculate the packing fraction for SC, BCC and FCC crystals.
(3)

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6. The intrinsic carrier density at 300 K in silicon is 1.62 x 10
16
/m
3
. If the electron and

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hole mobilities are 0.13 and 0.06 m
2
1/
1
S

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-1
respectively. Calculate the conductivity of
intrinsic silicon.
(3)
7. Distinguish hard and soft magnetic materials.

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(2)
8. Distinction between bulk, thin films and nano materials.
(3)
9. What are type II superconductors? Explain their importance.
(3)

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10. What is sputtering? Explain the advantages of sputtering deposition.
(3)
PART B (50 Marks)
11.(a) Describe Fraunhoper diffraction of light due to single slit and explain maxima and
minima conditions and derive the expression for resultant intensity.

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(
6
)
(b) Explain the working of He-Ne laser with the help of neat diagram by giving energy
level transitions.

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(4)
12.(a) Derive the expression for Planck's law of radiation by considering the Bose-Einstein
distribution function.
(5)
(b) Derive an expression for the velocity of propation of a plane e.m. wave in

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homogeneous, isotropic dielectric medium by using Maxwell's equations.
(
5
)
13.(a) Explain the salient features of Kronig-Penny model and its conclusions for formation

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of energy bands in solids.
(6)
(b) State and explain the Miller Indices.
(4)
14.(a) What are dielectrics? Explain different types of electric polarization mechanisms

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contributing to the total polarization of dielectric materials.
(6)
(b) What is superconductivity? Describe the preparation of high T, superconductors.
(4)
15.(a) Explain the construction and working of TEM-transmission electron microscope.

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(6)
(b) Describe the chemical vapour deposition (CVD) method for preparation of thin films. (4)
16.(a) Explain the preparation of nano materials by sol-gel method.
(5)
(b) What is the principle of X-ray fluorescence and mention its applications?

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(
5
)
17.(a) Describe the powder diffraction experimental method for determination of
"interplanner spacing" of a crystal.

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(5)
(b) What are ferrites? Explain its spinal and inverse spinal structure.
(5)
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