Hall Ticket No Question Paper Code: AHS006
INSTITUTE OF AERONAUTICAL ENGINEERING
(Autonomous)
B.Tech I Semester End Examinations (Regular) December, 2016
Regulation: IARE R16
ENGINEERING PHYSICS
(Common for CSE/IT/ECE/EEE)
Time: 3 Hours Max Marks: 70
Answer ONE Question from each Unit
All Questions Carry Equal Marks
All parts of the question must be answered in one place only
UNIT I
1. What is internal field in a dielectric? Obtain an expression for internal field for a one dimensional
array of dipoles and extend it to a cubic solid.
Explain the mechanisms of ionic and orientation polarization. Which one of them does not
depend on temperature?
2. Distinguish between para and diamagnetism. Give one example for each class of material.
Define magnetic field intensity and magnetic induction Derive relation between B&H.

UNIT II
3. Explain the construction of working ruby laser with energy level diagram
What is ratio of populations of the two energy levels correspondence to the lasing wavelength of
694.3nm in ruby laser
4. Define the term laser. What are the characteristics of laser beam
Describe the construction of He-Ne laser and explain its working with the help of energy level
diagram.
UNIT III
5. Compare the surface to volume ratios of a spherical object when the size (radius) is reduced from
1000 cm to 1 nm.
What are the causes for drastic changes in properties of a material when its size is reduced to
the nanoscale? Explain. List some important applications of nano materials.
6. Outline the sol gel and chemical vapour deposition techniques for the preparation of nano materials
with emphasis on the merits of each process
What are the main parts of a transmission electron microscope? Explain the working of a TEM
and list the applications of TEM.
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UNIT IV
7. Obtain the wave function for a particle in an infinite potential well along with normalization
condition. Specify wave function, energy and the probability densities for the ground and first
two excited
An electron is in the ground state in an infinite potential well of width 5A0, calculate the excitation
energy required to raise the electron to the third excited state.
8. Setup the time independent one dimensional Schrödinger wave equation.
Explain the deBroglie hypothesis and derive expression for deBroglie wavelength. Calculate the
deBroglie wavelengths of a photon and a proton having energy of 100 eV
(Mass of proton
UNIT V
9. Calculate the Hall coefficients in semiconductors with carrier densities equal to
i. 1.9 1014/cm3
ii. 1.6 1017/cm3
Determine the Fermi energy in the following cases with suitable energy level diagrams
i. Intrinsic semiconductor
ii. P-type semiconductor
iii. n-type semiconductor
10. What is the hall effect? Obtain the expression for hall coefficient.
Mobilities of electrons and holes in a sample of intrinsic germanium at 300K are 0:36m2V
and 0:17m2V respectively. If the resistivity of the specimen is 2:12
compute the
forbidden energy gap for germanium.
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