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Mobility of electrons in an extrinsic semi conductor is more than that of hole because

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Mobile electrons are in valence band and holes are in conduction band

Both mobile electrons and holes are in forbidden energy gap

Mobile electrons are in conduction band and holes are in valence band

Both mobile electrons and holes are in valance band

answer is C.

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Detailed Solution

Holes are always present in valance but not in conduction band

So they are more bound than electrons. The effective mass of electron is less

than that of holes and also their drift velocity is more than that of holes. Hence , mobility of Electrons in an extrinsic semi conductor is more than that of holes.

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