The temperature $(T)$ dependence of resistivity $(\rho)$ of a semiconductor is represented by

In a junction diode,the holes are due to

In a semiconductor,the number density of intrinsic charge carriers at $27^{\circ} \text{C}$ is $1.5 \times 10^{16} \, \text{m}^{-3}$. If the semiconductor is doped with impurity atoms,the hole density increases to $4.5 \times 10^{22} \, \text{m}^{-3}$. The electron density in the doped semiconductor is $..... \times 10^{9} \, \text{m}^{-3}$.

Write the difference between intrinsic and extrinsic semiconductors.

Which of the following statements is true for an $N$-type semiconductor?

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