# DIODES

Physics-1

Paper Code: PH101

Credit: 4

Module I

Oscillation:

1.1 Simple harmonic motion: Preliminary concepts. Superposition of S.H. Ms in two mutually perpendicular direction: Lissajous figure

1.2 Damped Vibration: Differential Equation and its solution, Logarithmic decrement, Quality factor.

1.3 Forced vibration: Differential equation and its solution, Amplitude and Velocity resonance, Sharpness of resonance. Application in L-C-R Circuit

Module II

OPTICS I:

2.1 Interference of electromagnetic waves: Conditions for sustained interference, double slit as an example. Qualitative idea of Spatial and Temporal Coherence, Conservation of energy and intensity distribution, Newton’s ring

2.2 Diffraction of light: Fresnel and Fraunhofer class. Fraunhofer diffraction for single slit and double sits. Intensity distribution of N-slits and plane transmission grating ( No deduction of the intensity distributions for N-slits is necessary), Missing orders. Rayleigh criterion, Resolving power of grating microscope. (definition and formulae)

Module III

OPTICS II:

3.1 Polarization: General concept of Polarization, Pane of vibration and plane of polarization, Qualitative discussion on Plane, Circularly and Elliptically polarization through reflection and Brewster’s law, Double refraction (birefringence) Ordinary and Extra-ordinary rays. Nicol’s Prism, Polaroid. Half wave plate and quarter wave plate

3.2 Laser: Spontaneous and stimulated emission of radiation, Population inversiton, Einstein’s A & B coefficient (derivation of the mutual relation), Optical and Condition necessary for active Laser action, Ruby Laser, He-Ne Laser-applications of laser.

3.3 Holography: Theory of holography, viewing the hologram, Applicaions

Module IV

Quantum Physics:

4.1 Concept of dependence of mass with velocity, mass energy equivalence, energy-momentum relation( no deduction required). Blackbody radiation: Rayleigh Jean’s Law (derivation without the calculation of number of sates), Ultraviolet catastrophe, Wien’s law, Plank’s radiation law (calculation of the average energy of the oscillator), Derivation of Wien’s displacement law and Sephan’s law from Plank’s radiation law. Rayleigh Jean’s law and Wien’s law as limitimg cases of Planck’s law. Compton Effect(calculation of Compton wavelength is required).

4.2 Wave-particle duality and de Broglie’s hypothesis, Concept of matter waves,Davisson-Germer experiment, Concept of wave packets and Heisenberg’s uncertainty principle.

Module 5:
Crystallography:

5.1 Elementary ideas of crystal structure : lattice, basis unit cell, Fundamental types of lattices –Bravais lattice, Simple cubic, f.c.c and b.c.c lattices, (use of models in the class during teching is desirable]
Miller indices and miller planes, Co-ordination number and Atomic packing factor.

5.2 X-ray: origin of Characteristic and Continuous X-ray, Bragg’s law (No derivation), Determination of lattice constant.