$A$ $N-$ 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,what will be the resistivity at $20 ^oC$ if the mobility of electrons is $1200 \text{ cm}^2/\text{V} \cdot \text{s}$? (in $\Omega \cdot \text{cm}$)

Write briefly on $n$-type and $p$-type semiconductors.

In an $n$-type semiconductor,the Fermi energy level lies

To obtain electrons as majority charge carriers in a semiconductor,the impurity mixed is

Explain the recombination coefficient of an intrinsic semiconductor and derive the relation $n_i^2 = n_e n_h$.