When a semiconductor is doped with a donor impurity, the number of _____.

the holes decrease and the electrons increase

The correct answer is Option (3) → the holes decrease and the electrons increase

When a semiconductor is doped with a donor impurity (pentavalent atom), it donates extra electrons to the conduction band.

This increases the number of electrons and decreases the number of holes due to recombination.

Answer: ☀ the holes decrease and the electrons increase