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.As the number of charge carriers increases,the conductivity of the semiconductor increases.Since resistivity is the reciprocal of conductivity,the resistivity (and thus the resistance) of a semiconductor decreases as the temperature increases.

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