STUPIDSID
Attempt any five from the following:-
1 (a)
Explain why we see beautiful colour in thin film when it is exposed to sunlight.
3 M
1 (b)
Why would you recommend use of optical fibre in communication system?
3 M
1 (c)
Draw the energy level diagram of He-Ne laser. What is its wavelength in visible range?
3 M
1 (d)
Calculate the De-Broglie wavelength of proton travelling with a velocity equal to 1/20th velocity of light.
(Mass of proton = 1.674 x 10-27kg)
(Mass of proton = 1.674 x 10-27kg)
3 M
1 (e)
The susceptibility of a paramagnetic material at 300 K is 3.7x10-3. Find its relative permeability at 300 K.
3 M
1 (f)
State and explain Ohm's law for magnetic circuit.
3 M
1 (g)
Define and name different ranges of vacuum in terms of pressure.
3 M
2 (a)
Explain with neat figure construction and working of Rotary pump. For which vacuum range is it used?
8 M
2 (b)
Write full form of LASER. Explain three main processes involved in the production of LASER with appropriate figures.
7 M
3 (a)
Derive the formula for numerical aperture for a step index fibre. Calculate the Acceptance angle for an optical fibre given that refractive index of core is 1.45 and refractive index of cladding is 1.4.
8 M
3 (b)
Explain the construction and working of semiconductor diode laser with proper sketches. What are merits and demerits of this laser?
7 M
4 (a)
In a Newton's ring experiment the diameter of the 10th dark ring changes from 1.4 cm to 1.27 cm when a liquid is introduced between the lens and the plate. Calculate the refractive index of the liquid.
5 M
4 (b)
Using the uncertainty principle show that an electron cannot pre-exist in free state in a nucleus.
5 M
4 (c)
A solenoid consisting of 500 turns and carrying 4 Amp current is 0.5 m long. Calculate:
(i) Magnetomotive force
(ii) Flux density B
(i) Magnetomotive force
(ii) Flux density B
5 M
5 (a)
A diffraction grating used at normal incidence gives a line 5400Å in certain order super-imposed on another line 4050Å of the next higher order. If the angle of diffraction is 30°, how many lines/cm are there on the grating?
5 M
5 (b)
Derive one dimensional time dependent Schrodinger equation for matter waves.
5 M
5 (c)
Explain construction and working of Atomic force microscope.
5 M
6 (a)
Explain the experimental method of determination of wavelength of spectral line using diffraction grating.
5 M
6 (b)
An electron is bound in one dimensional potential box with width 2.5Å. Assuming the height of the box to be infinite, calculate the first two permitted energy values of the electron.
5 M
6 (c)
Discuss the importance of molecular modelling in bio-physics study.
5 M
7 (a)
White light falls normally on a soap film of thickness 5x10-5cm and of refractive index 1.33. Which wavelength in the visible region will be reflected most strongly?
5 M
7 (b)
How the phenomenon of holography can be explained with interference and diffraction of light?
5 M
7 (c)
What are hard and soft magnetic materials? Explain these materials using their characteristic properties and applications.
5 M
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