Which of the following is an inorganic compound semiconductor?

Which one of the following statements is false?

In a $p$-type semiconductor,the acceptor level is at $50 \text{ meV}$ above the valence band. To produce one hole,the maximum wavelength of the light photon required is (Planck's constant,$h = 6.6 \times 10^{-34} \text{ Js}$ and speed of light in vacuum,$c = 3 \times 10^8 \text{ m/s}$) (in $\mu \text{m}$)

$A$ semiconductor is doped with phosphorous atoms as an impurity. The impurity levels created in the semiconductor are close to the

In $p-$type semiconductor,the majority charge carriers are

$A$ $P$-type semiconductor is: