Question

An energy gap exists between the two energy bands. This energy gap is known as

Answer 1

$\huge \mathfrak{Answer:-}$

The difference between the energy band of the valency band & conduction band are gap . It is denoted by ∆Eg.

$\implies$ K.T = 0.026ev

Where k = Boltzman constant

T = Room temp. = 298k = 2T°c

The energy gap is very very less in case of the metal & it's insulator generally not behave like conductor up to very high temp.

$\implies$ 1. Metal = ∆Eg << kT

$\implies$ 2.Insulator = ∆Eg>>KT

$\implies$ 3. Semi conductor = ∆Eg > KT

$\implies$ for silicon => ∆Eq = 1.1ev

$\implies$ for germanium => 0.68ev

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