 MORE IN Applied Physics 2
MU First Year Engineering (Semester 2)
Applied Physics 2
December 2014
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

1(a) A Light of wavelength 5880 A°.is inclined film of glass of R.I =1.5 such that the angle of refraction in the plate is 60°. Calculate the smallest thickness of the plate which will make it dark by reflection.
3 M
1(b) What is grating and grating element?
3 M
1(c) Define the terms:
(i) Total internal reflection
(ii) Numerical Aperture
(ii) Acceptance angle.
3 M
1(d) Differentiate Spontaneous and stimulated emission of radiation.
3 M
1(e) An electron is bounded in one dimensional potential well width 2A° But of infinite height.Find its energy values in second excited state.
3 M
1(f) In phase measurement by Lissajous pattern ellipse is obtained with major axis of 2cm and minor axis of 0.8 cm. Calculate phase change.
3 M
1(g) Why is superconductor termed as 'Perfect Diamagnet'.
3 M

2(a) With proper digram and necessary expressions explain how Newton's ring experiment is useful to determine the radius of curvature of planoconvex lens.
8 M
2(b) Derive the expression for numerical Aperture for a step index fibre. The N. A. of an optical fiber is 0.5 and core R.l. is 1.54. Find refractive index of cladding.
7 M

3(a) With neat energy level diagram describe the construction and working of He-Ne laser.
8 M
3(b) Explain the interference in then parallel film and derive the expression for path difference between reflected, rays, hence obtain the conditions of maxima and minima for interference with monochromatic light.
7 M

4(a) For plane transmission grating prove that dsin θ =nλ, n= 1,2,3, ...
5 M
4(b) What is Heisenberg's uncertainty principle ? Prove that electron cannot survive in the nucleus.
5 M
4(c) Differentiate Type-I and Type-II superconductors.
5 M

5(a) Calculate the minimum no. of lines in a grating which will just resolve in the first order whose wavetengths are, 5890 A° and 5896 A°.
5 M
5(b)

Derive one dimensional time dependent Schrodinger equation for matter wave.

5 M
5(c) Explain with neat diagram principle and working of SEM.
5 M

6(a) An electron and a photon each have a wavelength of 2A°. What are their momentum and energies ?
5 M
6(b) Explain construction and working of cathode ray Oscilloscope.
5 M
6(c) What are carbon nano tubes? Write their properties.
5 M

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