Explain the change in the band with the temperature of the intrinsic semiconductor by drawing figure.

Explanation

An intrinsic semiconductor will behave like an insulator at T = 0K as shown in figure (a).

At T = 0K temperature all the electrons are bound in the valence band and they are not in conduction band so electrons cannot flow, as a result it behave as insulators.
These thermally exicted electrons at `T gt 0K`, partially occupy the conduction band which is shown in figure.

Solid dots indicates electrons while empty dot indicates holes in the figure.
As shown in the figure, four electrons getting energy from valence band and have gone into conduction band so four holes shown in valence band.