Question

In a semiconductor, free electrons are present in _______

• A. The conduction band only.
• B. The energy gap only.
• C. The valence band only.
• D. Both (A) and (B).

Answer 1

The correct option is A The conduction band only.

In a semiconductor, there are two types of charge carriers i.e. holes and electrons. Holes are present in the valence band, electrons are present in the conduction band. More the electrons in the conduction band, more is the conductivity of a semiconductor.