Donor type impurity is found in

Holes are charge carriers in

In an $n$-type semiconductor, the Fermi energy level lies

$A$ $P$-type semiconductor has acceptor levels $57 \, meV$ above the valence band. The maximum wavelength of light required to create a hole is (Planck's constant $h = 6.6 \times 10^{-34} \, J-s$, speed of light $c = 3 \times 10^8 \, m/s$, charge of electron $e = 1.6 \times 10^{-19} \, C$)

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

Which of the following energy band diagrams shows the $N-$type semiconductor and $P-$type semiconductor respectively?