Choose the correct statement.

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(B) The correct statement is that when we heat a semiconductor, its resistance decreases.In semiconductors, the energy gap between the valence band an

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When we heat a semiconductor, its resistance decreases.

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(B) The correct statement is that when we heat a semiconductor, its resistance decreases.In semiconductors, the energy gap between the valence band and the conduction band is small.As the temperature increases, more electrons gain sufficient thermal energy to jump from the valence band to the conduction band.This increase in the number of charge carriers (electrons and holes) leads to an increase in conductivity.Since conductivity is the reciprocal of resistivity (and resistance), an increase in conductivity implies a decrease in resistance.

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