ENGINEERING PHYSICS — I PH 2111 Anna university previous year question paper download may/June 2009

B.E./B.Tech. DEGREE EXAMINATION, MAY/JUNE 2009.

First Semester

Civil Engineering

PH 2111 — ENGINEERING PHYSICS — I

(Common to all branches of B.E/ B.Tech.)

(Regulation 2008)

Time : Three hours Maximum : 100 marks

Answer ALL questions.

PART A — (10 × 2 = 20 marks)

1. Calculate the frequency of ultrasonic waves that can be generated by a nickel
rod of length 4 cm. (Young’s modulus of nickel = 207GPa and density of nickel
8900 kg/m3).
2. Write a note on Cavitations.
3. Give the principle of semiconductor diode laser.
4. Mention any four applications of laser in medicine.
5. Define acceptance angle in optical fiber communication.
6. What are the types of sensors used in fiber optic communication?
7. In Compton scattering, the incident photon have a wavelength 0.5nm.
Calculate the wavelength of scattered radiation if they are viewed at an angle
of 45° to the direction of incidence.
8. Explain the principle of Transmission Electron Microscope.
9. Differentiate polymorphism and allotropy.
10. Write a short note on Burger vector.
PART B — (5 × 16 = 80 marks)
11. (a) (i) Write down the properties of Ultrasonic waves. (6)
(ii) Describe the principle, construction and working of piezo-electric
oscillator. (10)
Or
(b) (i) Describe the various non-destructive testing methods. (9)
(ii) Explain the types of ultrasonic imaging systems. (7)
12. (a) (i) What is spontaneous and stimulated emission? (3)
(ii) Write down the conditions for population inversion. (3)
(iii) What is pumping action? Explain the methods commonly used for
pumping action. (10)
Or
(b) (i) Explain the construction and reconstruction of a hologram. (6)
(ii) In detail explain the principle, construction and working of a fourlevel
solid state laser. (10)
13. (a) (i) Explain in detail the losses in optical fiber with basic attenuation
mechanisms. (10)
(ii) Give the advantages of fiber-optic communication. (6)
Or
(b) (i) Find the numerical aperture and the acceptance angle of an optical
fibre whose core has a refractive index of 1.5 (Refractive index of
cladding = 1.447 and Refractive index of air = 1) (4)
(ii) What is the principle of fiber optics? (2)
(iii) Explain the various types of optical fibers. (10)
14. (a) (i) Explain Plank’s hypothesis. (6)
(ii) State and derive Plank’s law of Radiation. (10)
Or
(b) (i) Derive Schrodinger’s time dependent and time independent wave
equations. (10)
(ii) Give the physical significance of wave function Ψ . (6)
15. (a) (i) What is packing factor? Prove that the packing factor of HCP
crystal structure is 0.74. (6)
(ii) Explain the crystal structures of
(1) NaC1
(2) ZnS
(3) Diamond
(4) Graphite. (10)
Or
(b) Explain in detail the crystal defects and their types. (16)