Question $1$

$1$ pts

What does the band gap for a semiconductor or insulator describe?

The physical separation between the p$-$type and n$-$type regions of a semiconductor junction

The energy required for a photon to move an electron from a material's valence band to its conduction band.

The separation between the energy levels associated with the valence band and conduction band in the material.

The number electrons relative to the number of holes in a semiconductor