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APJ ABDUL KALAM 1. GiCAL UNIVERSITY
FIRST SEMESTER B.TECH DEGREE EXA MINA TION(S), DECEMBER 2019
Cowrsea பே 11140

Course Name: ENGI™'"ERING PHYSICS

Reg No.: ‏کو7‎

Max. Marks: 100 Duration: 3 Hours
PART A
Answer all questions, each carries 2 marks. Marks
1 Define sharpness of resonance. (2)
2 What will happen to fundamental frequency when length of string reduced (2)
to one third of original length kept under same tension?
3 What is meant by optical path? (2)
4 Distinguish between Fresnel and Fraunhofer diffraction. (2)
5 Distinguish between positive and necative crystals. (2)
6 Give any four applications of superconductivity. (2)
7 What is meant by an eigenvalue equation? (2)
8 What are microstates and macrostates? (2)
9 Define intensity of sound wave. Give its equation. (2)
10 Explain the principle of a piezoelectric oscillator. (2)
11 What are the characteristic properties of a laser? (2)
12 Define acceptance angle and numerical aperture of an optical fibre. (2)
PART 8

Answer any 70 quesiions, each carries 4 marks.

13 What is a damped harmonic oscillator? Draw the graph showing the (4)
variation of amplitude with time in case of over damped, critically damped
and under damped oscillator.

14 A wave is represented by y= 1.5sina (0,035 - 7t) where amplitude (4)
measured in meters and time in seconds. Evaluate Period, frequency, wave
length and velocity of the wave.

15 Write the construction and working of an antireflection coating. (4)

16 What should be the minimum number of lines in a grating which will just (4)
resolve in the second order of lines whose wavelengths are 5890A and
5896 A?

17 Calculate the minimum thickness of a quartz piate which would convert (०,

plane polarized light of v-avelength 589 nm ito circularly polarized light.
The principal refractive indices of 177 .-rdinary anc extra ordinary rays arc

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