ENGINEERING PHYSICS MODULE 4

2021 Scheme ENGINEERING PHYSICS 21PHY12/22 Module 4 Notes (Download👇)

21PHY12/22 MODULE 4

Electrical Conductivity in Solids

MODULE 4

Classical free electron theory: Drude- Lorentz theory & Assumptions, Expression for electrical conductivity (no derivation), Failures of classical free-electron theory.

Quantum free electron theory: Assumptions, Density of states (no derivation), Fermi-energy, Fermi factor & its temperature dependence, Fermi – Dirac Statistics, Expression for electrical conductivity (derivation), Merits of Quantum free electron theory.

Physics of Semiconductors: Fermi level in intrinsic semiconductors, Expression for concentration of electrons in conduction band, Holes concentration in valance band (only mention the expression), Conductivity of semiconductors (derivation), Hall effect, Expression for Hall coefficient (derivation).

Dielectrics: Electric dipole, Dipole moment, Polarization of dielectric materials, Types of polarizations. Qualitative treatment of Internal field in solids for one dimensional infinite array of dipoles (Lorentz field). Claussius-Mossotti equation (derivation), Numerical problems.

DOWNLOAD MODULE 1 NOTES (21PHY12/22)

DOWNLOAD MODULE 2 NOTES (21PHY12/22)

DOWNLOAD MODULE 3 NOTES (21PHY12/22)

DOWNLOAD MODULE 5 NOTES (21PHY12/22)