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In an intrinsic semiconductor, electrons and holes are:

AFixed in place
BEqual in number
CUnequal in count
DAbsent entirely
Answer & Solution
Correct answer: B. Equal in number
1. Every electron promoted upward leaves a vacancy behind. 2. Carriers are therefore created in pairs. 3. So electrons equal holes in an intrinsic semiconductor. 4. The answer is equal in number. _Source: syllabus Physics, Ch 14 'Semiconductor Electronics'_
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