Questions
Mobility of electrons in an extrinsic semi conductor is more than that of hole because
a
Mobile electrons are in valence band and holes are in conduction band
b
Both mobile electrons and holes are in forbidden energy gap
c
Mobile electrons are in conduction band and holes are in valence band
d
Both mobile electrons and holes are in valance band
detailed solution
Correct option is C
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.Talk to our academic expert!
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