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00000PH100121805

What is the highest order spectrum which may be seen with monochromatic

light of wavelength 6000A by means of diffraction grating with 5000 lines/em?

Define a half wave plate and deduce the expressions for the thickness of half
wave plate made of positive and negative crystal materials.

State and explain Meissner effect with the help of appropriate diagrams. Show
that super conductors act as perfect diamagnetic substances.

Obtain time dependent Schrodinger equation.

What is Phase Space? Obtain the smallest volume of a cell in phasespace for a
quantum system.

The dimensions of an auditorium are 60m x 15m x10m and its interior surfaces
have an average absorption coefficient of 0.25. Find the reverberation time of
the auditorium.

Explain any two methods of detection of ultrasonics.

Explain the method of construction and re-construction of image in holography.
An optical fibre has core of refractive index 1.5. The difference in refractive
indices is 0.018. Calculate (i) refractive index of cladding (ii) acceptance angle

and (iii) numerical aperture of the fibre.

PART C

Answer any three questions, each carries 6 marks.
Write the differential equation of a Damped harmonic oscillator whose damping
force is proportional to its velocity and obtain the solution for the same.
Derive the necessary equation to determine refractive index of a liquid using
Newton’s rings.
Explain the principle, construction and working of a Nicol Prism.
a) Compare BE and FD statistics.

b) Explain significance of Fermi energy.

PART D
Answer any three questions, each carries 6 marks.
Define reverberation and reverberation time. What is the significance of
reverberation time? Compare reverberation and echo.
Explain how sound navigation and ranging is done using ultrasonic waves.

An ultrasonic wave of frequency 0.1 MHz is sent towards the seabed returns

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