Let nP and ne be the number of holes and conduction electrons respectively in a semiconductor. Then
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a
nP > ne in an intrinsic semiconductor
b
nP = ne in an extrinsic semiconductor
c
nP = ne in an intrinsic semiconductor
d
ne > nP in an intrinsic semiconductor
answer is C.
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Detailed Solution
In intrinsic semiconductors, the creation or liberation of one free electron by the thermal energy creates one hole simultaneously. Thus, in intrinsic semiconductors ne = nh.