B B2802 for Pages

Reg No.: 012 Name: 000000
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIRST/SECOND SEMESTER B.TECH DEGREE EXAMINATION, APRIL 2018
(Regular & Supplementary)
Course Code: PH100
Course Name: ENGINEERING. PHYSICS

ന്‌ |
)
0

Max. Marks: 0 Duration: 3 Hours
PART A

Answer all questions, each question carries 2 marks. ‏نے‎

1 What will happen to fundamental frequency of the wave in a stretched string (2)
when tension of the string increases 4 times and its length reduced to half the
original length?
2 What is meant by sharpness of resonance? (2)
3 How an antireflection coating is constructed? (2) |
4 When slit width increases, what will happen to central maximum? Why? (2) |
5 Explain the phenomenon double refraction. (2)
6 Superconductor is a perfect diamagnet. Justify. (2)
7 A well-behaved wave function is normalised. Why? (2)
8 What is Tunnel effect? What is quantum mechanical Tunnelling? (2)
9 What is threshold hearing intensity? (2)
10 What is piezoelectric effect? (2)
11 How holography differs from photography? ^ (2)
12 What is Photovoltaic effect? 2)
PART B
Answer any 10 questions, each question carries 4 marks.

13 Point out any four similarities between electrical and mechanical oscillators (4)

A parallel beam of light (A = 600nm) falls on a glass plate (u = 1.5) at an angle of (4) |
incidence 30°, Calculate smallest thickness of the plate so that it will appear dark
by reflection.

15 Explain different force components acting on a forced and damped harmonic (4)
oscillator and establish the differential equation of forced harmonic oscillator
16 A grating is illuminated at normal incidence. At an angle of diffraction 45° 8 (4)

certain order of light of wavelength 500 nm is superimposed on another one of
wavelength 400 nm in the next higher order. Evaluate the number of lines per |
meter of the grating used.
17 Linearly polarized light is changed into circularly polarized light after passing (4)
through a slice of crystal 2.5x10° m thick. Find the wavelength of light used, if
the difference in refractive indices for ordinary and extraordinary rays is 0.005.
18 Compare Type 1 and Type II superconductors. (4) 1 i
19 An electron and a proton are moving with same kinetic energy. Which one ‏كقط‎ (4)
shorter wavelength. Why?

Page 1 of 2 i