If $n_e$ and $v_d$ are the number of electrons and drift velocity in a semiconductor, respectively, what happens when the temperature is increased?

What are impure semiconductors,doping,and dopants?

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 $\mu \text{m}$)

Holes are charge carriers in

In a $P$-type semiconductor,the acceptor energy levels $E_A$ are located:

If the ratio of electron and hole currents in a semiconductor is $\frac{7}{4}$ and the ratio of drift velocities of electrons and holes is $\frac{5}{4}$, then the ratio of concentrations of electrons and holes will be