SEMESTER II

THEORY PAPER

MARKS: 75

(i) ACOUSTICS –

(a) THEORY OF VIBRATIONS: Analytical treatment of free, damped, forced and resonant vibrations.

(b) INTENSITY AND LOUDNESS OF SOUND: bel, phon, measurement of intensity by Rayleigh disc method, Reverberation time, deduction of Sabine’s law, determination of absorption coefficient.

(ii) OPTICS –

(a) COHERENCE: Temporal and spatial coherence, Interference in thin films, Newton’s rings, Michelson’s interferometer.

(b) DIFFRACTION: Fresnel and Fraunhoffer diffraction, half-period zones, Zone plate, Plane diffraction grating.

(c) POLARISATION OF LIGHT: double refraction, Nicol’s prism, Construction of wave fronts in uniaxial crystals, Quarter wave plate, Production and detection of plane, circularly and elliptically polarized light, Rotatory polarization and polarimeters.

(d) VELOCITY OF LIGHT: Group and phase velocity (concept to be brought by superposition of two waves), Kerr cell method for determining the velocity of light.

(iii) ELECTROSTATICS – Electric polarization and displacement vectors, D = e_oE + P relation (by simple method – slab placed in electric field between plates), Energy density (by simple spherical distribution of charge), Boundary conditions of D vector and E vector at the interface of two dielectric media and their application to a dielectric sphere in uniform electric field.

LAB SESSION

MARKS : 25

(i) Kundt’s tube method of measuring the velocity of sound

(ii) Melde’s experiment.

(iii) Spectrometer : refractive index by symmetry method.

(iv) High resistance measurement.

(v) Low resistance measurement.