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. Calculate the thickness of (i) a quarter wave plate (11) a half wave plate. Given படி = 1.553

and ലം 1.553 and 4 = 50002.

. What is Meissner effect? Prove that a superconductor acts as a perfect diamagnet.
. An electron confined in an one dimensional box of width ‘L’ is known to be in its first

excited state. Determine the probability density of electron in the central half.

. Distinguish between Bose-Einstein statistics and Fermi- Dirac statistics.
. The area of interior surface of an auditorium is 3340 722. Its reverberation time is 1.5

seconds. If average absorption coefficient of interior surface is 0.4, find the volume of
auditorium.

. With a neat circuit diagram explain the working of a Piezoelectric Oscillator to produce

ultrasonic waves.

What type of pumping method is used in ruby laser? Draw the energy level diagram of a
ruby laser.

Mention any four applications optical fibre.

PART ©
Answer any 3 questions. Each question carries 6 marks

Derive an expression for the velocity of transverse waves in stretched uniform string.
Obtain an expression for fringe width in wedge shaped thin film.

Distinguish between type I and type II superconductors with relevant graphs.

State Heisenberg’s uncertainty principle. Write its mathematical form for the following
pairs of variables (i) position and momentum (ii) energy and time (iii) angular position
and angular momentum. How this principle can be used to prove the absence of electrons
inside the nucleus of an atom.

PART D

Answer any 3 questions. Each question carries 6 marks.

What are the basic requirements of an acoustically good hall?

What are NDT and SONAR? How ultrasonic waves are used in it?

What is holography? How is it different from ordinary photography? Draw the diagrams
illustrating the recording and reconstruction of a hologram.

With a neat diagram obtain an expression for the numerical aperture of an optical fibre.

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