Question Detail
Question
In intrinsic semiconductors at room temperature, the number of electrons and holes are ______.
Correct Answer
Option B is the correct answer.
Detailed Explanation
In an intrinsic (pure) semiconductor at thermal equilibrium, any electron that is thermally excited from the valence band to the conduction band leaves behind a hole in the valence band. Therefore, the number of electrons in the conduction band (n) is equal to the number of holes in the valence band (p).
Hint
Consider what happens when an electron gains enough energy to move from the valence band to the conduction band in a pure semiconductor.