24.

25;
26.

27.

28.

30.
31.

32.

Calculate the thickness of a doubly refracting crystal required to introduce a path
difference ೦೫/2 between the ordinary and extra ordinary rays. Given A=6000 A’,
४०८1 .544, ൮൦ .5533.

What is super conductivity? Define transition temperature and critical magnetic field.
What is the significance of operators in Quantum mechanics? What is Hamiltonian
operator? Write its expression. ۱
Write any four assumptions of Maxwell - Boltzmann Statistics.

Calculate the reverberation time of a hall having volume 4000022 and total sound ം
absorption of 160 ന sabine.

An ultrasonic source of 0.09 MHz sends down a pulse towards the sea bed which
returns after 0.55 second. The velocity of sound in water is 1800 m/s. Calculate the
depth of the sea and wave length of the pulse.

What is population inversion? How it can be achieved?

Name the principle behind the propagation of light through an optic fibre. How the
essential conditions for this phenomenon is satisfied in optic fibres. List three
advantages of fibre optic communication.

Part-C
Answer any 3 questions. Each question carries 6 marks

Derive one-dimensional wave equation and write its solution.
With the help of a diagram, deduce the conditions for darkness and brightness in the
case of Fraunhofer diffraction at a single slit. Obtain the width of central maximum.
How a Nicol prism can be constructed from a calcite crystal. How can it be used as a
polarizer and analyzer?
Write the Schrodinger equation for a particle in one dimensional infinite square well
potential and derive the normalized wave function.

Answer any 3 questions. Each question carries 6 marks.
How can you produce ultrasonic waves using piezoelectric oscillator.
Explain the factors affecting the acoustics of a building.
"Laser is light amplification by stimulated emission of radiation." Define the terms
absorption, spontaneous emission and stimulated emission. Derive the relation between
Einstein coefficients.
What is a hologram? How can it be re- constructed? Write any 2 advantages of

holograms over photographic images.