PCS 125 Chapter Notes - Chapter 14: Electrical Resistivity And Conductivity, Light-Emitting Diode, Electronvolt
3 Aug 2018
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Document Summary
It is the branch of science which deals with the electron flow through a vacuum, gas or semiconductor. Classification of substances on the basis of conduction of electricity. We know that, each substance is composed of atoms. Substances are mainly classified into three categories namely solids, liquids and gases. In each solid atoms are at a definite positions and the average distance between them is constant. Depending upon the internal arrangement of atoms, solids are further divided into two groups: crystalline solids. The solid in which the atoms are arranged in a regular order are called the crystalline solids. In other words, we can say that in a crystalline solid. there is periodicity and regularity of its component atoms in all the directions. Their atoms are arranged in a definite geometrical shape. They are anisotropic, i. e. , their physical properties such as thermal conductivity refractive index etc, are different in different directions. They are the real solids: amorphous solids.
