if `n_(e)` and `v_(d)` be the number of electrons and drift velocity in a semiconductor. When the temperature is increased.

Options

A. `n_e` increases and `v_d` decreases
B. `n_e` decreases and `v_d` increases
C. Both `n_e` and `v_d` increases
D. Both `n_e` and `v_d` decreases

Answer

A

Explanation

The conductivity of a semiconductor increases with temperature. Hence the number of free electrons (`n_e`) will l also increase. But the drift velocity `v_d=i/((n_e)eA)`
Hence as `n_e` is increased, `v_d` is decreased.