The conductivity of a semiconductor increases with increase in te… - Vidyadip

MCQ

The conductivity of a semiconductor increases with increase in temperature because:

A
Number density of free current carriers increases.
B
Relaxation time increases.
C
Both number density of carriers and relaxation time increase.
✓
Number density of current carriers increases, relaxation time decreases but effect of decrease in relaxation time is much less than increase in number density.

✓

Answer

Correct option: D.

Number density of current carriers increases, relaxation time decreases but effect of decrease in relaxation time is much less than increase in number density.

With increase in temperature, the number density of current carries increases, relaxation time decreases but effect of decrease in relaxation is much less than increase in number density. So, the conductivity of a semiconductor increases with increase in temperature.

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