First slide

Classification of Metals, semiconductors and insulators

Question

Statement I: If the temperature of a semiconductor is increased, then its resistance decreases.
Statement II: The energy gap between conduction band and valence band in a semiconductor is very small.

Moderate

A

Both statements I and II are correct.
B

Statement I is correct but statement II is incorrect
C

Statement I is incorrect but statement II is correct
D

Both statements I and II are incorrect.

Solution

In semiconductors the energy gap between conduction band and valence band is small ( $\approx$ 1 eV). Due to temperature rise, electron in the valence band gained thermal energy and may jump across the small energy gap, goes in to the conduction band. Thus conductivity increases and hence resistance decreases.

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