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Posted By: Nithya Krishna Member Level: Gold Posted Date: 29 May 2008
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2007 Anna University B.E Computer Science PH 1X01-ENGINEERING PHYSICS Question paper
B.E/B.Tech. DEGREE EXAMINATION, APRIL/MAY 2007
Annual Pattern-First Year
Computer Science and Engineering
PH 1X01-ENGINEERING PHYSICS
Answer all the questions:
PART A-(10 X 2=20 marks)
1.Define reverberation and reverberation time.
2.Define co-ordination number and calculate the same for fcc lattice.
3.What do you understand by quarter and half wave plates?
4.What is a black body and what are its characteristics?
5.What is numerical aperture? How is it useful in optical fibres?
6.Define density of states and sketch the same for a metal.
7.Differentiate between intrinsic and extrinsic semiconductor.
8.The Hall coefficient of a semiconductor was to be -7.35 X 10-5 m3C-1 from 100 to 400 K. What is the nature of the semiconductor? If the electrical conductivity was found to be 200 ohm-1m-1. Calculate the density.
9.A crystal is subjected to an electrical field of 1000 Vm-1 and the resultant polarisation is 4.3 X 10-8 C/m2. Calculate the relative permittivity of the crystal.
10.What are the merits of X-ray fluoroscopy?
PART B-(5 X 16=80 marks)
11.(a).(i).Explain the principle of magnetostriction and piezoelectric effect?
(ii).With a neat diagram explain the working of a magnetostriction oscillator.
(iii).What is SONAR?
(iv).Discuss any two factors affecting the acoustic of building and its remedies.
(Or)
11.(b).(i).With reference to crystals explain unit cell, atomic radius and packing fraction.
(ii).Show that the atomic packing fraction for hcp and fcc are the same.
(iii).For a single cubic lattice show that
d100: d110: d111=v6: v3: v2
12.(a).(i).Describe Michelson interferometer and explain the formation of fringes.
(ii).How this can be used for measuring the wavelength of monochromatic light?
(iii).The movable mirror of Michelson interferometer is moved through a distance of 0.02603 mm. Find the number of fringes shifted across the cross wire if the wave length used is 5206 Å.
(Or)
12.(b).(i).Explain the terms stimulated emission and population inversion.
(ii).Discuss the working of a semiconductor Laser.
(iii).Classify optical fibres and discuss the characteristic features.
(iv).What are the advantages of an optical fibre communication system over the conventional one?
13.(a).On the basis of free electron theory derive an expression for the electrical and thermal conductivities of metal and hence establish Wiedemann-Franz law.
(Or)
13.(b).Explain the terms emission power and absorptive power. Derive Plank’s law for black body radiation and hence deduce Wien’s law and Rayleigh Jean’s law.
14.(a).(i).With suitable diagram explain direct and indirect band gap of a semiconductor.
(ii).Explain with necessary theory how the band gap of a semiconductor is determined.
(iii).What is Hall effect? Describe an experimental set up for the measurement of Hall voltage.
(Or)
14.(b).(i).What is Meissner effect?
(ii).What is isotopic effect?
(iii).How does the critical magnetic field vary with temperature in Type I and Type II superconductor?
(iv).What are high Tc superconductors?
(v).The critical temperature when its mass 199.5 is 4.184 K. Calculate the critical temperature when its mass (isotopic) changes to 203.4.
15.(a).(i).Explain the different types of polarization in dielectrics.
(ii).What is meant by local field?
(iii).How it is calculated for a cubic structure?
(iv).Deduce Clausius-Mosotti equation.
(Or)
15.(b).(i).What are shape memory alloys?
(ii).Mention two applications of bio-materials.
(iii).What is radiography?
(iv).With a neat diagram explain the working of an ultrasonic flaw detector.
(v).In what way this technique is preferred over radiography.
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