Band Gap

Ask

Semiconductor A has a higher band gap than Semiconductor B.If both
have same dimensions, the same number of electrons at a given temperature and
the same electron & hole mobilities, then:
(a) A has the same number of holes as B
(b) A has larger number of holes than B
(c) A has lesser number of holes than B
(d) all of above

Answer is (b)

Concept

The empty energy levels refer to the Holes Filled in Valence  Band
Thereby, an HIGHER BAND GAP implies Greater number of Holes.