Question Detail
Question
When a pentavalent impurity is added to a pure semiconductor, it becomes
Correct Answer
Option D is the correct answer.
Detailed Explanation
A pentavalent (Group V) dopant contributes an extra free electron, creating an N-type (electron-majority) semiconductor.
Hint
Pentavalent = 5 valence electrons = one extra electron donated → think 'N' for negative carrier.