Anna University Trichy 2009 B.E Computer Science and Engineering Hs1102 engineering physics 1 - Question Paper

PART-A (10*2=20 MARKS)
1.How are ultrasonic waves used to measure the depth of the sea?
2.A quartz crystal of thickness 0.001m is vibrating at resonance. compute the fundamental frequency.
Density of quartz 2.650*10^8kg/m^3 and young's modulus for quartz 7.9*10^10 Nm^-2
3.Give the important characteristics of LASER.
4.List any 4 applications of lasers in Engineering.
5.What are active and passive sensors?
6.Calculate the numerical aperture,acceptance angle, and the critical angle of a fiber having core refractive index=1.50 and the cladding refractive index=1.45.
7.What is the physical significance of wave function?
8.Give the special features of Quantum theory of radiation.
9.What are Bravais lattice?
10.Define Miller indices and draw the crystal planes for (110) and (001).
PART-B (5*16=80 MARKS)
11.(a)Explain how inverse piezo electric effect can be applied for the production of ultrasonic waves using piezo electric oscillator.
(b)Describe a method of determining the wavelength of ultrasonic waves in liquid using the principles of diffraction.
Or
12.(a)Explain in detail different scanning modes using ultrasonic waves.
(b)Write a short note on Sonogram with neat sketch.
13.(a)Explain the modes of vibration of CO2 molecule.
(b)Describe the construction and working of CO2 laser with necessary diagram.
Or
14.(a)With suitable diagram discuss how laser action is achieved in homojunction and heterojunction inGa-As laser.
(b)Explain how a hologram is recorded and reconstructed using coherent beam?
15.(a)Derive an expressions for Acceptance angle and Numerical Aperture of an optical fibre.Bring out the difference ranging from step index and graded index fibre.
(b)Write a note on fibre optic pressure sensor.

Earning:   Approval pending.