The process of adding impurities to a pure semiconductor is called

Electric conduction in a semiconductor takes place due to

The valence of an impurity added to germanium crystal in order to convert it into a $P-$type semiconductor is

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 $\Omega\cdot\text{cm}$?

When an $N-$type semiconductor is heated,what happens to the charge carriers?

Which one of the following statements is false?