In $N$-type semiconductors,the majority charge carriers are

In an $n-$type semiconductor,which of the following statements is true?

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

Explain the recombination coefficient of an intrinsic semiconductor and derive the relation $n_i^2 = n_e n_h$.

When a small amount of antimony impurity is added to a germanium crystal,what happens?

The impurity atom added to germanium to make it $N-$type semiconductor is