17

26

^ 1103 Pages: 2

If a quartz plate act as a half wave plate for plane polarized light of
wavelength ೫, then show that the same plate would act as quarter wave
plate for a wavelength 2 2.

What is superconductivity? Define transition temperature and critical
magneticfield.

Estimate the de Broglie wavelength of an electron moving with a kinetic
energy of 100 eV.

What is Fermi level? Give it's physical significance

A hall has dimensions of 25mX 20mX 8m. The reverberation time is 4 s.
Determine the average absorption coefficient of the surfaces.

Calculate the capacitance required to produce ultrasonic waves of
frequency 1 MHz with an inductance of 1 H.

Compare photographs and holograms.

With a block diagram, explain the working of an optical communication
system.
PART ^
Answer any three questions, each carries 6 marks.

Solve the differential equation of a damped harmonic oscillator. Explain
the time displacement curve of over dumped, critically damped and under
damped cases

Explain the formation of interference fringes using air wedge. How is it

கைலை வைடு ೦ (|) determine the വിടട്ടെ... ‏ےت‎

27

28

29

30

31
32

Describe an experiment to produce elliptically polarized light beam out of
a plane polarized one. How will you detect the same?
Write the Schrodinger equation for a particle trapped in a one dimensional
box of width L and solve it to obtain the energy eigen values.

PART D

Answer any three questions, each carries 6 marks.

Define intensity of sound. Write an expression for it. Distinguish between
threshold of hearing intensity and pain intensity.

What is inverse piezoelectric effect? With the help of a circuit diagram
explain the production of ultrasonic waves using a piezoelectric oscillator.
Explain construction and working of Ruby laser.

Explain the principle of OFC. Distinguish between step index and graded

index fibres. Give any two advantages of optical fibres.
1317;

Page 2 of 2

(4)

(4)
(4)

(4)
(4)

(4)

(4)
(4)

(6)

(6)
(6)

(6)

(6)
(6)

(6)
(6)