Electrical Properties of Materials | Physics for Electronics Engineering
Subject and UNIT: Physics for Electronics Engineering: Unit II: Electrical and Magnetic Properties of Materials
Anna university Part - B '16' marks important questions and important assignment problems
Physics for Electronics Engineering
Subject and UNIT: Physics for Electronics Engineering: Unit II: Electrical and Magnetic Properties of Materials
Anna university Part - A '2' marks question and answer
Subject and UNIT: Physics for Electronics Engineering: Unit II: Electrical and Magnetic Properties of Materials
Anna university important solved problems in Electrical Properties of Materials
Subject and UNIT: Physics for Electronics Engineering: Unit II: Electrical and Magnetic Properties of Materials
The effective mass plays an important role in conduction process of semiconductors and insulators since they have full or almost filled valence bands.
Definition, Derivation
Subject and UNIT: Physics for Electronics Engineering: Unit II: Electrical and Magnetic Properties of Materials
The mass acquired by an electron when it is accelerated in a periodic potential is called effective mass of an electron. It is denoted by m*.
Properties of Solids
Subject and UNIT: Physics for Electronics Engineering: Unit II: Electrical and Magnetic Properties of Materials
In solid, ionic cores at fixed lattice locations and free electron gas enveloping these ionic cores. In other words, it is assumed that the solid already exists. The ionic cores are 'tightly bound' to their lattice locations. The electrons are 'free' to run through the extent of the solid. This is called the 'Free electron approximation'.
Definition, Concept of bands, Classification of Metals
Subject and UNIT: Physics for Electronics Engineering: Unit II: Electrical and Magnetic Properties of Materials
A solid contains an enormous number of atoms packed closely together. In the case of a single isolated atom, there are discrete energy levels, 1s, 2s, 2p, 3s .... These energy levels can be occupied by the electrons of the atom.
Band theory of solids (Zone theory)
Subject and UNIT: Physics for Electronics Engineering: Unit II: Electrical and Magnetic Properties of Materials
The free electron theory explains the properties like thermal conductivity, electrical conductivity and specific heat of most of the metals. But, it fails to explain why some solids are conductors, some are insulators and others are semiconductors
Definition, Derivation | Electrical Properties of Materials
Subject and UNIT: Physics for Electronics Engineering: Unit II: Electrical and Magnetic Properties of Materials
The ability of a metal to conduct electricity depends on the number of quantum states and also the energy levels which are available for the electrons. Hence, it is essential to find the energy states which are available for the occupation of the electrons (charge carriers).
Definition, Formula, Example Problems, Derivation, Energy Levels, Uses | Electrical Properties of Materials
Subject and UNIT: Physics for Electronics Engineering: Unit II: Electrical and Magnetic Properties of Materials
Fermi - Dirac statistics deals with the particles having half integral spin like electrons. They are known as Fermi particles or Fermions. Fermi distribution function gives the distribution of electrons among the various energy levels as a function of temperature.
Electrical Properties of Materials
Subject and UNIT: Physics for Electronics Engineering: Unit II: Electrical and Magnetic Properties of Materials
The same energy eigen value but different eigen functions. Such a state of energy levels is called degenerate state.
Definition, Postulates, Merits, Demerits, Example, Equation
Subject and UNIT: Physics for Electronics Engineering: Unit II: Electrical and Magnetic Properties of Materials
The failures of classical free electron theory were rectified in quantum theory given by Sommerfeld in the year 1928. This theory uses quantum concepts and hence it is known as quantum free electron theory. Sommerfeld used Schrodinger's wave equation de-Broglie's concept of matter waves to obtain the expression for electron energies. He approached the problem quantum mechanically using Fermi - Dirac statistics instead of classical Maxwell - Boltzmann statistics.