Which of the followin is correct regarding band theroy of solids?

Options

A. The energy bands which are completely filled at `0 K` are called valence bands. The bands with higher energies are called conduction bands
B. The difference between the highest energy in a band and the lowest energy in the next higher band is called band gap between the two bands
C. Band gap for `Si(1.1 eV), Ge(0.7 eV)`, for insulators (about `5 eV)`
D. All option are correct

Answer

D

Explanation

NA