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(C) In a semiconductor,the valence band and conduction band are separated by a small energy gap. At higher temperatures,thermal energy is provided to

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both number of free electrons and number of holes increase

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(C) In a semiconductor,the valence band and conduction band are separated by a small energy gap. At higher temperatures,thermal energy is provided to the electrons in the valence band. This energy allows electrons to overcome the energy gap and jump into the conduction band. As an electron moves to the conduction band,it leaves behind a vacancy in the valence band known as a hole. Therefore,an increase in temperature results in the generation of both free electrons and holes,leading to an increase in the number of both charge carriers.

When the temperature of a semiconductor increases,then:

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