In $n$-type semiconductor,electrons are majority charge carriers,but it does not show any negative charge. The reason is:

In an intrinsic semiconductor at room temperature,the number of electrons and holes are

In a $p-$type semiconductor,which of the following statements is true?

For extrinsic semiconductors,when the doping level is increased:

The rate of recombination or generation of charge carriers in a semiconductor is governed by the law$(s)$ of:

At a temperature of $500 \ K$,the intrinsic electron number density $(n_e)$ and hole number density $(n_h)$ in a pure semiconductor are equal to $1.5 \times 10^{16} \ m^{-3}$. Now,by adding indium impurity,the hole density $(n_h)$ increases to $4.5 \times 10^{22} \ m^{-3}$. This doped semiconductor is: