The valence band at 0 K is-

The valence band and the conduction band of a substance overlap at ordinary temperatures The substance may be

The valence band of sodium is filled to the extent

The valence band and conduction band of a solid overlap at low temperature, the solid may be

The valence band and conduction band of a solid overlap at low temperature .The solid may be

The valence band and conduction band of a solid overlap at low temperature, the solid may be

Assertion : The electrons in the conduction band have higher energy than those in the valence band of a semiconductor Reason : The conduction band lies above the energy gap and valence band lies below the energy gap.

Assertion : The electrons in the conduction band have higher energy than those in the valence band of a semiconductor Reason : The conduction band lies above the energy gap and valence band lies below the energy gap.