In a semiconductor let the number of charge carriers be n and the average drift speed be v. An electric field is applied to it. If we increase the temperature of this semiconductor then:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → n will increase but v will decrease
As we increase the temperature, additional electron -hole pairs are created in the semiconductor.
As a result, number of charge carrier (n) increases.
Now,
$v_d=\frac{eEZ}{m}$
and, Temperature ∝ $\frac{1}{Z}$
∴ Temperature ∝ $\frac{1}{v_d}$
Hence, $v_d$ decreases