JEE · NEET Previous Year Question

$The conductivity of semiconductor increases with increase in temperature because$

Topic: JEE PYQ

Answer: C. Full step-by-step solution below.

A $both number density of charge carriers and relaxation time increase$
B $number density of charge carriers increases$
C $number density of current carriers increases, relaxation time decreases but effect of decrease in relaxation time is much less than increase in number density$
D $relaxation time increases.$

Correct answer: C

Solution

(c) Due to increase in temperature bonds break which liberates large number of holes and electrons (charge carriers). Relaxation time too decreases but its effect is much less.