Question

Let $n_p$ and $n_e$ be the number of holes and conduction electrons in an extrinsic semiconductor. Then

• A. $n_p>n_e$
• B. $n_p=n_e$
• C. $n_p<n_e$
• D. $n_p\ne n_e$

Answer 1

Answer: (D)

$n_p\ne n_e$

In extrinsic semi conductor the number of holes are not equal to number of electrons i.e.
$n_p\ne n_e$
In p - type $n_p>n_e$
In n - type $n_e>n_p$
But over all both p & n -type semi conductor are unchanged.