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

Donor type impurity is found in

Which of the following when added as an impurity into silicon produces $n-$type semiconductor?

What are $n$-type and $p$-type semiconductors? Name the majority and minority charge carriers in each.

For pure $Ge$,the intrinsic carrier density is $10^{19} \ m^{-3}$. If donor impurity is added with a density of $10^{23} \ m^{-3}$,what will be the hole density (in $m^{-3}$)?

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?