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00000PH100121804

Pages: 2

Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
B.Tech examinations (S) September 2020 S1/S2 (2015 Scheme)

Course Code: PH100
Course Name: ENGINEERING PHYSICS

PARTA
Answer all questions, each carries 2 marks.
Explain any two practical cases of damping.

State the laws of transverse vibration of a stretched string.
What are antireflection coatings?
Define dispersive power of a grating and write an expression for it.
What is optic axis and principal section of a doubly refracting crystal?
Define critical temperature and critical field of a superconductor.
Justify the statement “11௦ light source can emit true monochromatic light”.
Distinguish between bosons and fermions.
What is echelon effect? How can it be remedied?
How ultrasonic waves are detected using a thermal detector?
What are the basic components of a laser system?
What is the working principle of LED?
PART ‏تا‎

Answer any 10 questions, each carries 4 marks.
The frequency of a tuning fork is 500 Hz and its Q factor is 7x10* Find the
relaxation time. Also calculate the time after which its energy becomes (1/10)
of its initial undamped value.
The equation of transverse vibration of a stretched string is given by
y =0.00327 sin (72.1x-2.72t), x and y are in metre and t in seconds.
Evaluate (1) Amplitude (ii) Wavelength (iii) Frequency and (iv) Velocity of
wave.
Account for the colours of thin films viewed in white light.

Two lines in the second order spectrum of a plane transmission grating are
resolved. If the lines are due to lights of wavelengths 5890 A° and 5896 A’.
Find the minimum number of lines in the grating.

Explain how anisotropy in crystalline solids contributes to double refraction.

Explain Type I and Type 11 Superconductors.

An electron is confined in a potential which closely approaches an infinite

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Duration: 3 Hours

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