CET-K / COMED-K

PHYSICS 1. WAVES AND SOUND · Waves: formation of waves, types of waves, wave amplitude, frequency, wave length and velocity - relation n =f l - equation for progressive wave, intensity, super position of waves. Problems · Sound: Properties, velocity in gases, Newton - Laplace formula, factors affecting velocity - intensity and loudness, units, Noise and Music beats as an example of superposition of waves, Doppler effect, formula for general case, discussion for individual cases. Problems · Stationary waves: Modes of vibration in pipes, laws of vibration of stretched strings, sonometer, Problems. · Ultrasonics: Production (mention of methods), properties and applications · Acoustics of buildings: reverberation, Sabine's formula (mention), requisites for good acoustics and methods of achieving them. 2. PHYSICAL OPTICS · Introduction to theories of light · Interference of light: Coherent sources, Young's double slit experiment, expression for path difference, conditions for constructive and destructive interference, width of interference fringes. Problems · Diffraction of light: Fresnel and Fraunhofer diffraction, Fraunhofer diffraction through a single slit (qualitative explanation), limit of resolution, Rayleigh's criterion, resolving powers of telescopes and microscope. Problems · Polarisation of light: transverse nature of light waves, methods of producing plane polarised light, Brewster's law, double refraction, dichroism, polariods and their applications, optical activity and specific rotation. Problems.