B B7025

Total Pages: 2
Reg No.: Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIRST SEMESTER B.TECH DEGREE EXAMINATION, DECEMBER 2017

Course Code: PH100
Course Name: ENGINEERING PHYSICS

Max. Marks: 100 Duration: 3 Hours
PART A
Answer all questions. Each question carries 2 marks Marks
1 What is meant by amplitude resonance? Give any two examples. (2)
2 Define frequency and wavelength of a wave. (2)
3 What are non reflecting films? (2)
4 Compare interference and diffraction of light. (2)
5 What is Kerr effect? Give the equation. (2)
6 Write down four important applications of Super conductors. 2)
7 What is tunnelling effect? (2)
8 Define phase space. (2)
Define intensity of sound .Give the values of threshold of hearing and threshold
9 of pain. (2)
10 What is meant by non destructive testing (NDT)? Name an NDT technique? (2)
11 Define the terms population inversion and meta stable level. (2)
12 What is an LED? Give its working principle. (2)
PART B
Answer any 10 questions. Each question carries 4 marks
13 The frequency ofa tuning fork is 250 Hz and its Q-factor is 40105. Find the (4)
relaxation time. Also calculate the time after which its energy becomes 1/10 of its
initial undamped value.
14 a Obtain the differential equation of the oscillation of an electric circuit. (2)
b Compare it with mechanical oscillator. (2)
15 ೩. What is Rayleigh’s criterion for spectral resolution? (2)
b Obtain the expression for resolving power of a plane transmission grating. (2)
16 What is the higher order spectrum which may be obtained with a light of (4)
wavelength 5500 A using a plane transmission grating having 4500 lines per cm.
17 The refractive indices of Quartz for light of wavelength 5890 A are 1.5539 for (4)
ordinary ray and 1.5634 for extra ordinary ray.Calculate the required thickness of
the Quartz crystal for making a)a QWP and b)aHWP.
18 a What is Meissner effect? (2)
b What are Type I and Type 11 Superconductors(any two points)? (2)
19 8 What are the important postulates of Bose-Einstein Statistics? 3)
b पाट down the distribution equation of BE Statistics. (1) |
20 State Uncertainty principle. Using this principle calculate the uncertainty in (4)
frequency of the emitted radiation if the uncertainty in time of an excited atom is |
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