 MORE IN Applied Physics 2
MU First Year Engineering (Semester 2)
Applied Physics 2
December 2013
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

Attempt any five:-
1 (a) Explain why an extensive thin film appears dark in reflected light?
3 M
1 (b) How will you increase the resolving power of a diffraction grating?
3 M
1 (c) Calculate the numerical aperture of a fibre with core index n1 = 1.61 & cladding index n2 = 1.55.
3 M
1 (d) What if the difference between spontaneous & stimulated emissions.
3 M
1 (e) An electron is bound by a potential which closely approaches an infinite square well of width 2.5Å m. Calculate the first lowest permissible energy for electron.
3 M
1 (f) Write any two applications of CRO.
3 M
1 (g) What is MAGLEV?
3 M

2 (a) What do you understand by anti-reflection coating? Derive conditions with proper diagram.
8 M
2 (b) What is N.A.? Consider multimode step under fibre with n1 = 1.53 and n2 = 1.50 and λ = 1μm. If the core radius = 50μm then calculate the normalised frequency of the fibre (V) and the number of guided mode.
7 M

3 (a) What is the difference between holography & photography? Discuss the construction & reconstruction of image in holography with neat diagram.
8 M
3 (b) Derive the condition for maxima and minima due to interference of light reflected from a thin film of uniform thickness.
7 M

4 (a) What is the highest order spectrum which can be seen with monochromatic light of wavelength 6000Å by means of a diffraction grating with 5000 lines/cm.
5 M
4 (b) Explain the Heisenberg's uncertainty principle.
5 M
4 (c) What are type I & type II superconductors?
5 M

5 (a) A plane diffraction grating just resolve two lines in the second order. Calculate the grating element if dλ = 6Å, λ = 6×10-5cm and the width of the ruled surface is 2cm.
5 M
5 (b) Derive Schrodinger's time independent wave equation.
5 M
5 (c) Explain the working of SEM with a neat diagram.
5 M

6 (a) Find energy of neutrons in units of electronvolts where De-Broglie wavelength is 1Å.
Mass of neutron = 1.674 10-27kg
Plank's constant = 6.620 10-34J/sec.
5 M
6 (b) Write a short note on electrostatic focusing.
5 M
6 (c) What are carbon tubes and what are their properties.
5 M

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