Question

If $n_e$ and $v_d$ be the number of electrons per unit volume and drift velocity of the electrons, in a semiconductor. When its temperature is increased,

• A. only $n_e$ decreases
• B. only $n_e$ increases
• C. both $n_e$ and $v_d$ increases
• D. both $n_e$ and $v_d$ decreases

Answer 1

The correct option is B only $n_e$ increases

As the temperature of a semiconductor is increased, $n_e$ increases.

The drift velocity is given by,
$v_d=\frac{I}{n_{e}A{q}_e}$
The drift velocity reduces, as $n_e$ increases

Hence, $\left(B\right)$ is the correct answer.