When the conductivity of a semiconductor is only due to the breaking of the covalent bonds,the semiconductor is called

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 $m^3$):

$A$ hole in a $P-$type semiconductor is

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

Which impurity is doped in $Si$ to form an $N$-type semiconductor?

In an $n$-type semiconductor,the free electrons donated by the impurity atoms occupy energy levels in: