What is classical free electron theory?
This theory is also known as band theory of solids. Classical Free Electron Theory (Drude-Lorentz Theory): Free Electron Concept: All metal atoms consists of valance electrons and they are responsible for physical properties. of metals such as electrical & thermal conductivities, thermoelectricity, thermionic &
Who proposed classical free electron theory?
P. Drude
The classical free electron theory was introduced by P. Drude in 1900 and developed by Lorentz in 1909 to explain electrical conduction in metals.
What are the types of free electron theories?
Drude and Lorentz gave classical free electron theory of metals theory in 1900. Another name for this theory is Drude –Lorentz theory of metals. Classical theory says that the metals having free electrons obey the laws of classical mechanics.
What are the limitations of classical free electron theory?
The electrical conductivity of semiconductor and insulator cannot be explained by this theory. 3. The concept of photo – electric effect, Compton effect and black body radiation cannot be explained on the basis of this theory because these phenomenon are based on quantum theory.
What is the difference between classical free electron theory and quantum free electron theory?
The key difference between classical theory and quantum theory is that classical theory describes the nature of macroscopic level, whereas quantum theory describes the nature of microscopic level.
What is classical theory of electron?
The classical free electron theory was proposed by Drude and Lorentz in 1900. This theory said that metals with free electrons obey the laws of classical mechanics.
What are special features of classical free electron theory of solids?
Classical free electron theory: The first theory was developed by Drude and Lorentz in 1900. According to this theory, metal contains free electrons which are responsible for the electrical conductivity and electrons obey the laws of classical mechanics.
Why is called free electrons?
These loose electrons are called free electrons. They can move freely throughout the metallic structure. An electric current is the flow of these free electrons in one direction. Energy is required to make the free electrons travel in one direction.
What is free electron example?
Metals atoms have loose electrons in the outer shells, which form a ‘sea’ of delocalised or free negative charge around the close-packed positive ions. These loose electrons are called free electrons. They can move freely throughout the metallic structure.
What is the classical free electron theory?
Classical free electron theory: The first theory was developed by Drude and Lorentz in 1900. According to this theory, metal contains free electrons which are responsible for the electrical conductivity and electrons obey the laws of classical mechanics.
What gave rise to quantum free electron theory?
2. • Failures of classical free electron theory gave rise to Quantum free electron theory by Sommerfield.
What is electron theory of solids?
Electron theory is applicable to all solids, both metals and non metals. In addition, it explains the electrical, thermal and magnetic properties of solids. The structure and properties of solids are explained employing their electronic structure by the electron theory of solids. It has been developed in three main stages. 1.
What is free electron theory of metals by Lorentz-Drude?
free electron theory of metals by Lorentz- Drude : 1 This theory was developed by Lorentz & Drude in 1900 2 In metals there are large number of free electrons moving freely in all possible directions 3 free electrons in the metals are assumed to behave like gas molecules obeying the kinetic theory of gases