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Question

(B) At room temperature,some of the valence electrons acquire thermal energy greater than $E_{g}$ (energy gap between the conduction and valence band)

Vedclass · Accepted Answer

a vacancy created when an electron leaves a covalent bond

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(B) At room temperature,some of the valence electrons acquire thermal energy greater than $E_{g}$ (energy gap between the conduction and valence band) and become free. When a valence electron is shifted to the conduction band,it leaves behind a vacancy in the valence band. This vacancy is known as a hole and it acts as a charge carrier with a positive charge.

$A$ positive hole in a semiconductor is

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