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InterviewSolution
| 1. |
Explain free electron model of conduction. |
| Answer» Solution :We know that electrons from OUTERMOST orbit which participate in bonding phenomenon during the formation of a crystal. Electrons from outermost orbits can be TWO types, namely valence electrons and conduction electron. The energy level of valence electron is lower and it remains BOUND to the nucleus. valence electrons are responsible for bonding. The energy level of conduction electrons is high. Conduction electrons cannot reamain bound to a particular nucleus. Conduction electrons can move freely inside the volume of material . energy of free electron is higher but it is not sufficient to escape from the system because when one conduction electron escapes, then the remaining system attains positive CHARGE and attracts back the electron into the system. These conduction electrons are know as free electrons, metallic conduction conduct electricity through them. Insulating MATERIALS do not have sufficient free electrons to cannot electricity through them . | |