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

In a sample of pure silicon, $10^{13} \text{ atoms/cm}^3$ of phosphorus is added. If all donor atoms are active and the electron mobility is $1200 \text{ cm}^2/\text{V}\cdot\text{s}$, what will be the resistivity at $20^\circ\text{C}$ in $\Omega\cdot\text{cm}$?

The majority charge carriers in $p$-type and $n$-type semiconductors are respectively:

In extrinsic $P$ and $N$-type semiconductor materials,the ratio of the impurity atoms to the pure semiconductor atoms is about

Which one of the following statements is true? $A$ p-type semiconductor is doped with

For extrinsic semiconductors,when the doping level is increased: