In the energy band diagram of a material shown below,the open circles and filled circles denote holes and electrons respectively. The material is a/an

$A$ $P$-type semiconductor is .......

Which of the statements given is true for a $p$-type semiconductor?

What will be the conductivity of a pure silicon crystal at $300 \ K$ temperature,if the electron-hole pairs per $cm^3$ is $1.072 \times 10^{10}$ at this temperature,$\mu_e = 1350 \ cm^2/V \cdot s$ and $\mu_h = 480 \ cm^2/V \cdot s$?

To obtain $P$-type $Si$ semiconductor,we need to dope pure $Si$ with

In a pure silicon crystal,the electron-hole concentration is $10^{16} \ m^{-3}$ at $301 \ K$. Now,$10^{21}$ atoms of phosphorus are added per cubic metre. The new hole concentration in silicon is (in per $m^3$):