Forbidden energy gap of a semiconductor

increases with temperature

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decreases with temperature

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slightly increase ,then decrease with temperature

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does not change with temaperature

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Solution

The correct option is B decreases with temperature
Forbidden energy gap in semiconductors is of the order of kT. So as we increase the temp, electrons from the top of the valence band would gain thermal energy and gets excited into the C.B, so band gap would decrease with increase in temp. Hence forbidden energy gap of a semiconductor decreases with increase in temperature. therefore option B is correct.

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