|| 10 PHY-12
|| Engineering Physics
PART – A
Introduction to Blackbody radiation spectrum, Photo-electric effect, Compton
effect. Wave particle Dualism. de Broglie hypothesis – de Broglie
wavelength, extension to electron particle. – Davisson and Germer
Matter waves and their Characteristic properties. Phase velocity, group
velocity and Particle velocity. Relation between phase velocity and group
velocity. Relation between group velocity and particle velocity. Expression
for deBroglie wavelength using group velocity.
Heisenberg’s uncertainity principle and its physical significance. Application
of uncertainity principle (Non-existence of electron in the nucleus,
Explanation for β-decay and kinetic energy of electron in an atom). Wave
function. Properties and Physical significance of a wave function. Probability
density and Normalisation of wave function. Setting up of a one dimensional,
time independent Schrödinger wave equation. Eigen values and Eigen
functions. Application of Schrödinger wave equation – Energy Eigen values
for a free particle. Energy Eigen values of a particle in a potential well of
Electrical Conductivity in Metals
Free-electron concept. Classical free-electron theory - Assumptions. Drift
velocity. Mean collision time and mean free path. Relaxation time.
Expression for drift velocity. Expression for electrical conductivity in metals.
Effect of impurity and temperature on electrical resistivity of metals. Failures
of classical free-electron theory.
Quantum free-electron theory - Assumptions. Fermi - Dirac Statistics.Fermienergy
– Fermi factor. Density of states (No derivation). Expression for
electrical resistivity / conductivity. Temperature dependence of resistivity of
metals. Merits of Quantum free – electron theory.
Dielectric & Magnetic Properties of Materials
Dielectric constant and polarisation of dielectric materials. Types of
polarisation. Equation for internal field in liquids and solids (one
dimensional). Classius – Mussoti equation. Ferro and Piezo – electricity
(qualitative). Frequency dependence of dielectric constant. Important
applications of dielectric materials. Classification of dia, para and ferromagnetic
materials. Hysterisis in ferromagnetic materials. Soft and Hard
magnetic materials. Applications.
PART – B
UNIT - 5
Principle and production. Einstein’s coefficients (expression for energy
density). Requisites of a Laser system. Condition for Laser action.
Principle, Construction and working of He-Ne and semiconductor Laser.
Applications of Laser – Laser welding, cutting and drilling. Measurement of
atmospheric pollutants. Holography – Principle of Recording and
reconstruction of 3-D images. Selected applications of holography.
Optical Fibers & Superconductivity
Propagation mechanism in optical fibers. Angle of acceptance. Numerical
aperture. Types of optical fibers and modes of propagation. Attenuation.
Applications – block diagram discussion of point to point communication.
Temperature dependence of resistivity in superconducting materials. Effect
of magnetic field (Meissner effect). Type I and Type II superconductors -
Temperature dependence of critical field. BCS theory (qualitative). High
temperature superconductors. Applications of superconductors–
Superconducting magnets, Maglev vehicles and squids
Space lattice, Bravais lattice - unit cell, primitive cell. Lattice parameters.
Crystal systems. Direction and planes in a crystal. Miller indices. Expression
for inter-planar spacing. Co-ordination number. Atomic packing factor.
Bragg’s Law. Determination of crystal structure by Bragg’s x-ray
spectrometer. Crystal structures of NaCl, and diamond.
Introduction to Nanoscience and Nanotechnology. Nanomaterials: Shapes of
nanomaterials, Methods of preparation of nanomaterials, Wonders of
nanotechnology: Discovery of Fullerene and carbon nanotubes, Applications.
Ultrasonic non-destructive testing of materials. Measurements of velocity in
solids and liquids, Elastic constants.