The conductivity of a semiconductor increases with increase in temperature because

Options

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

Answer

D

Explanation

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