The phenomena such a photoelectric effect, compton effect and the black body radiation couldnt be explained by classical free electron theory. Your browser does not currently recognize any of the video formats. 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 free electron theory of metals the evolution of the free electron. The main assumptions of classical free electron theory are. This theory is called quantum free electron theory. According to this theory, the metals containing free electrons obey the laws of classical mechanics. Free electron theory of metals nicholas research group. Drude theory of conduction basics of free electron theory and electrical conductivity part 1 duration. Classical free electron theory could not explain many physical properties. According to this theory the electrons are moving freely and randomly moving in the entire.
Apr 22, 2020 classical free electron theory of metals engineering physics edurev notes is made by best teachers of civil engineering ce. 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. According to this free electron in a metal valence electron move randdomly at room. Classical theory of freeelectron lasers book iopscience. According to classical free electron the electronic specific heat is equal to r 2 3 while the actual value is 0. Classical free electron theory electrical conductivity the classical free electron theory was proposed by drude and lorentz.
Classical free electron theory permits all electrons to gain energy. Atomic selectrons are delocalised due to overlap of outer orbits. Pdf free electron theory 201516 vtu shashank mohan. A physics 12 talk titled the classical free electron theory. What are the drawbacks of classical free electron theory.
From the instant of sudden disappearance of an electric field across a metal, the average velocity of the conduction electrons decays. Classical free electron theory is modeled by drude lorentz to explian elctrical conductivity in metals. Due to kinetic theory of gas drude assumed, conduction electrons of. This theory cannot explain the electron conductivity of semiconductors and insulators. 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. From the classical free electron theory the value of specific heat of metals is given by.
This document is highly rated by civil engineering ce students and has been viewed 10656 times. Drude in 1900 and developed by lorentz in 1909 to explain electrical conduction in metals. Unit1 classical free electron theory physics youtube. According to the classical free electron theory the value of specific heat of metals is given by 4. 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. B m s institute of technology classical free electron theory.
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