If a small amount of antimony is added to germanium crystal,

Which one of the following statements is true? $A$ p-type semiconductor is doped with

In a $P$-type semiconductor, the acceptor energy level $E_A$ is located $57 \, meV$ above the valence band. The maximum wavelength required to create a hole is ....... $\mathring{A}$. (Given: $h = 6.6 \times 10^{-34} \, J \, s$, $c = 3 \times 10^8 \, m/s$, $1 \, eV = 1.6 \times 10^{-19} \, J$)

When $Ge$ crystals are doped with phosphorus atoms,then it becomes

In a $P$-type semiconductor,the energy level formed in the forbidden gap near the valence band is called ...

Write briefly on $n$-type and $p$-type semiconductors.