MODEL QUESTION PAPER

EN2K6 102: ENGINEERING PHYSICS

Time: 3Hours Marks: 100
Part A: Answer all questions

1a). Explain Fresnel’s and Fraunhoffer diffraction.
b). Describe double refraction in crystals.
c). Explain a wavefunction.
d). Explain the basic principle of electron spin resonance.
e). Discuss the signal distortion in optical fibres.
f). Write a note on ultrasonic method of nondestructive testing.
g). Distinguish between conductors, semiconductors and insulators on the basis of Fermi energy level.
h). Explain Josephson effect.

Part B: Answer four questions

2 a) Describe the theory of a plane transmission grating and describe how it is used to determine the wavelength of light.
b) Calculate the specific rotation if the plane of polarization is turned through 26.40 traversing 20cm length of 20% sugar solution.

Or

3 a) Discuss with necessary theory, the Newton’s rings experiment to determine the wavelength of sodium light.
b) An air wedge of angle 0.01 rad is illuminated by monochromatic light of 6000 Å falls normally on it. At what distance form the edge of the wedge will the 10th fringe be observed by the reflected light.

4 a) With the basic principle explain any one application of NMR.
b) Find the energy of an electron moving in one dimensional potential well of infinite height, width 1 Å. Given mass of an electron 9.11 x 10-31 kg and h= 6.63 x 10-34 Js

Or

5 a) Distinguish between Newtonian and quantum mechanics. By assuming time independent Schrödinger’s equation find eigen values and eigen functions for a particle in a box.
b) Explain Heisenberg's uncertainty principle.

6 a) Obtain an expression for numerical aperture and explain briefly point to point communication using optical fibres.
b) What are the requisities for laser action.

Or

7 a) With the energy level diagram explain the construction and working of He-Ne laser.
b) Find the ratio of the two energy states of the ruby laser, the transition between which is responsible for the emission of photons of wavelength 694.3 nm. Assume the ambient temperature as 270C, Boltzmann constant k = 1.38 Χ 10-23 J/K and Planck’s constant h = 6.63 Χ 10-34 Js

8 a) Discuss the effect of magnetic field on superconductors. Distinguish between typeI and typeII superconductors.
b)Explain Wiedman-Frenz law.

Or

9 a) With theory explain how Hall voltage and Hall coefficient are measured?
b) Write a note on BCS theory of superconductivity.