The forbidden energy gap in the energy bands of germanium at room temperature is about $......$ $eV$.

In the case of a semiconductor,which of the following statements is wrong?

The Fermi energy level of an intrinsic semiconductor lies:

In semiconductors at room temperature,which of the following statements is correct regarding their energy bands?

Pure sodium $(Na)$ is a good conductor of electricity because the $3s$ and $3p$ atomic bands overlap to form a partially filled conduction band. By contrast,the ionic sodium chloride $(NaCl)$ crystal is:

The intrinsic semiconductor becomes an insulator at