At $0 \ K$,a piece of germanium:

Give a brief explanation of solid state semiconductor electronics.

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

Assertion : The resistivity of a semiconductor increases with temperature.
Reason : The atoms of a semiconductor vibrate with larger amplitude at higher temperatures,thereby increasing its resistivity.

The Fermi energy level of an intrinsic semiconductor lies:

Which of the energy band diagrams shown in the figure corresponds to that of a semiconductor?