Classical free electron theory pdf file

The valence electrons of metallic atoms are free to move in the spaces between ions from one place to another place within the metallic specimen similar to. Classical free electron theory could not explain many physical properties. Give the assumptions of the classical free electron theory. B m s institute of technology classical free electron theory. Unit1 classical free electron theory physics youtube. Pdf free electron theory 201516 vtu shashank mohan. Free electron theory of metals request pdf researchgate. Classical free electron theory permits all electrons to gain energy. This document is highly rated by civil engineering ce students and has been viewed 10656 times. In 1928, sommerfeld developed a new theory applying quantum mechanical concepts and fermidirac statistics to the free electrons in the metal.

Due to kinetic theory of gas drude assumed, conduction electrons of. According to this theory the electrons are moving freely and randomly moving in the entire. Classical free electron theory of metals engineering. Atomic selectrons are delocalised due to overlap of outer orbits. What are the drawbacks of classical free electron theory. According to this free electron in a metal valence electron move randdomly at room. Srit unit iii free electron theory engineering physics. The phenomena such a photoelectric effect, compton effect and the black body radiation couldnt be explained by classical free electron theory. Drude theory of conduction basics of free electron theory and electrical conductivity part 1 duration. The classical free electron theory was introduced by p. According to classical free electron the electronic specific heat is equal to r 2 3 while the actual value is 0. Put free electrons into a very wide potential well the same size. Your browser does not currently recognize any of the video formats. From the classical free electron theory the value of specific heat of metals is given by.

Classical free electron theory is modeled by drude lorentz to explian elctrical conductivity in metals. According to the classical free electron theory the value of specific heat of metals is given by 4. According to this theory, the metals containing free electrons obey the laws of classical mechanics. This textbook focuses on the fully classical theory of fels with application to fel oscillators and develops the fundamentals of fel theory in sufficient depth to provide both a solid understanding of fel physics and a solid background for research in the field. The main assumptions of classical free electron theory are. Classical theory of freeelectron lasers book iopscience.

A physics 12 talk titled the classical free electron theory. A metal is imagined as the structure of 3dimensional array of ions in between which, there are free moving valence electrons confined to the body of the material. Free electron theory of metals nicholas research group. The free electron theory of metals the evolution of the free electron. A classical theory of th e electron, proposed by one of us several years ago and based on finitedifference equations, is discussed by considering the three possible following cases. This theory cannot explain the electron conductivity of semiconductors and insulators. From the instant of sudden disappearance of an electric field across a metal, the average velocity of the conduction electrons decays.