Silicon is a semiconductor. If a small amount of $As$ is added to it,then its electrical conductivity . . . . . . .

An $n$-type and a $p$-type silicon semiconductor can be obtained by doping pure silicon with

Which of the following statements is $\underline{TRUE}$ for $n$-type semiconductor?

Indium impurity in germanium makes

$A$ pure $Si$ crystal has $5 \times 10^{28}$ atoms $m^{-3}$. It is doped with $1 \, ppm$ concentration of pentavalent $As$. The number of holes is (Take $n_i = 1.5 \times 10^{16} \, m^{-3}$)

Minority carriers in a $p$-type semiconductor are