Shanmugha Arts Science Technology and Research Academy (SASTRA) University 2009 B.Tech Electronics and Communications Engineering ENGINEERING PHYSICS ( ) - Question Paper

SASTRA UNIVERSITY
Subject Name ENGINEERING PHYSICS
examination TYPE MAY-2009
PART-A
ans all the ques.. 20x2=40M.
01. What are characteristics of LASER radiation?
02. Mention few medical applications of LASERs.
03. What is Holography?
04. Define Acceptance angle.
05. Calculate the critical angle of silica fiber having the refractive index indices of 1.5 at the core and 1.47 at the cladding respectively.
06. Define the term Crystal Structure.
07. State the relation ranging from thermal conductivity and electrical conductivity.
08. State Wied-mann Franz legal regulations.
09. What are intrinsic and extrinsic semiconductors.
10. Explain the chemical bond in silicon.
11. What are dielectrics and ferroelectrics?
12. Define dielectric polarization.
13. Explain the term super conductors.
14. What is meant by local field in a dielectric?
15. What is super conducting transition temperature?
16. What are Ultrasonic waves?
17. Give 2 psychological effects of Ultra sound therapy.
18. Explain Fluoroscopy.
19. What are Nuclear medicine imaging devices?
20. Mention 2 radioactive sources used in nuclear medicine along with its application.
PART-B
ans all the ques.. 4x15=60M
21. Describe the principle, construction and working of CO2 LASER with neat diagram.
(OR)
22. Explain clearly the princiole of a fibre and define the construction of an Optical fibre. elaborate the uses of Optical fibre?
23. Based on Drude- Lorentz theory, derive an expression for electric conductivity of a metal.
(OR)
24. Derive an expression for the Hall coefficient. define an experiment to determine the identical.
25. Deduce Clausius- Mosotti formula for a cubic crystal and define,
(i)Dielectric loss (ii)Dielectric strength.
(OR)
26. Show that meissener’s effect is the deciding property of a super conductor.
27. Define acoustic Impedance. define an experiment to determine acoustic impedance of a specimen.
(OR)
28. Distinguish ranging from Radiography and fluoroscopy. provide a few important Radioisotopes and their uses in nuclear medicine.
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Earning:   Approval pending.