Discussion
Conduction band electrons have more mobility than holes because they are
Answer: C
Conduction electrons are more mobile because they collide less frequently.
An electron moves through the conduction band, which is largely empty, so its mean free path between scattering events is long. A hole moves by successive electrons hopping into it within the crowded valence band, so its effective mass is larger and its progress slower - in silicon, electron mobility is about three times hole mobility.
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