Reg No.:

0000PHT110121801 B Pages: 3

Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

First Semester B.Tech Degree Regular and Supplementary Examination December 2020 (2019 Scheme)

Max. Marks: 100

11 a)

b)

12 a)

b)

Course Code: PHT110
Course Name: ENGINEERING PHYSICS B
(2019 Scheme)
PARTA
Answer all questions, each carries 3 marks.
List any six points to compare mechanical and electrical oscillators.
Derive one dimensional wave equation
Explain the principle and working of antireflection coatings.
Distinguish between Fresnel and Fraunhofer classes of diffraction.
Listany two characteristics of matter waves. Find the expression for de

Broglie wavelength.

Define zero,one and two dimensional nanomaterials.
How echo is different from reverberation?
Write a note on SONAR. Give any two uses of it.
Define metastable state and population inversion.
Differentiate between step index and graded index fibre.
PART छ
Answer one full question from each module, each question carries 14 marks

Module-I
Frame the differential equation of a damped harmonic motion and obtain its

solution. Mention the different cases.

The frequency of a tuning fork is 300Hz. If its Q- factor is 5X 104, find the
time after which its energy becomes (1/10) of its initial value.

Discuss the propagation of a transverse wave along a stretched string and
derive the expression for frequency.

A uniform steel wire has length 10m and mass 2 kg. Find the Tension in the

string if the speed of transverse wave on the wire is 340m/s.

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Duration: 3 Hours

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