When a semiconductor is heated,its resistance

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(A) In a semiconductor,the number of charge carriers (electrons and holes) increases exponentially with an increase in temperature due to the thermal

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Decreases

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(A) In a semiconductor,the number of charge carriers (electrons and holes) increases exponentially with an increase in temperature due to the thermal excitation of electrons from the valence band to the conduction band.Although the mobility of charge carriers decreases slightly due to increased scattering,the effect of the rapid increase in the number of charge carriers dominates.As a result,the conductivity of the semiconductor increases,which implies that its resistance decreases with an increase in temperature.

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