Dr.A.P.J.Abdul Kalam University
Bachelor of Engineering
First Semester Main Examination, Dec-2020
Physics (PH110T)
Branch: CS/EX/EC/IT
Time: 3:00 Hrs Max Marks 70
Note: 1. Attempt any Five questions out of Eight.
2. Answer should be precise & to be point only.
3. Assume suitable data if necessary & state them clearly
Q.1 (a) Describe and explain the formation of Newton’s rings in reflected
monochromatic light.
(b) Give the theory of interference due to coherent sources and deduce the
expression for fringe with.
Q.2 (a) Describe a PN Junction diode? Draw the volt-ampere characteristics of PN
Junction diode.
(b) An n-type Ge sample has a donor density of 1021/m3
. It is arranged in Hall
effect experiment having magnetic field of 0.5 tesla and current density 500
A/m2
, Find the Hall voltage if the sample is 3 mm wide.
Q.3 (a) Describe and explain thin film of interference.
(b) Newton’s rings are observed normally in reflected light of wavelength
5.89 X 10-5
cm. the diameter of the 10th dark ring is 0.50 cm. Find the radius of
curvature of the lens and the thickness of the film.
Q.4 (a) Explain three processes occurring when a light wave interacts with matter.
(b) Describe the relationship between the Einstein’s co-efficient.
Q.5 (a) What is Compton effect? Obtain an expression for the shift in the
wavelength of X-ray beam?
(b) An electron is bound in one dimensional infinite well of with 200 A0
. Find
the difference in energy values of first excited and second excited states in
electron volts.
Q.6 (a) What are particle accelerators? Explain the construction and working of
LINAC?
(b) Write short notes on mass defect and binding energy.
Q.7 (a) What are matter waves? Show that
(b) Derive Schrödinger’s time dependent and time independent wave equations.
Q.8 Write short notes on: (Any two)
(a) G.M. Counter
(b) Population Inversion
(c) Hall Effect
(d) Coherent Sources
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