April 2005(For ECE,CSE and EEE)

Sree Narayana Guru College of Engineering and Technology, Payyanur
Second series test - April 2005

ENGINEERING PHYSICS
(For ECE,CSE and EEE)

Time: 2Hours Marks: 50

Part A: Answer all questions

1 Discuss the applications of laser
2 Discuss the signal distortion in optical fibres
3 Explain Avalanche breakdown and Zener breakdown
4 For Copper at 1000K, find the energy at which the probability P(E) that a conduction electron state will be occupied is 0.90
(4x5=20)

Part B: Answer three questions

5 (a) With a neat energy level diagram, explain the mechanism of He-Ne laser (5 Marks)
(b) Calculate the refractive indices of the core and cladding material for an optical fiber with the following data:
NA=0.22 D=0.012 (5 Marks)

OR

6 (a) With a neat energy level diagram, explain the mechanism of Ruby laser (5 Marks)
(b) A step index fiber has the following parameters: n1=1.68 n2=1.44 Calculate the critical angle, maximum angle of refraction, NA and acceptance angle (5 Marks)


7 (a) Explain the method of recording a hologram (4 Marks)
(b) Write notes on isotope effect and Meissner effect (6 Marks)

OR

8 (a) Explain the reconstruction of image in holography (4 Marks)
(b) Discuss the salient features of BCS theory of superconductivity (6 Marks)


9 Explain with the energy band diagrams, the classification of solids into metals, semiconductors and insulators. (10 Marks)

OR

10 Write notes on the following:
(a) Semiconductor laser (5 Marks)
(b) Light propagation in optical fibres (5 Marks)