An extrinsic semiconductor sample has 6 billion silicon atoms and 3 million pentavalent impurity atoms. The number of electrons and holes is

Electronics and Communication Engineering (ECE) : Electronic Devices and Circuits - Quiz(MCQ)

3 million each

6 billion each

3 million free electrons and very small number of holes

3 million holes and very small number of free electrons

Correct Answer : Option (C) : 3 million free electrons and very small number of holes

Explanation : When pentavalent impurity is added, the number of fresh electrons is very large as compared to number of holes.

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