Question

Let n_p and n_e be the numbers of holes and conduction electrons in an extrinsic semiconductor.
(a) n_p > n_e
(b) n_p = n_e
(c) n_p < n_e
(d) n_p ≠ n_e

Answer 1

(d) n_p ≠ n_e

Extrinsic semiconductors are formed by doping either an n-type material or a p-type material with a pure semiconductor, Thus, it may have more number of holes (if the doping material is of p type) or more number of electrons (if the doping material is of n type).