Let nP and ne be the number of holes and conduction electrons respectively in a semiconductor. Then

(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

(c) In intrinsic semiconductors, the creation or liberation of one free electron by the thermal energy has created one hole. Thus in intrinsic semiconductors  nP=ne

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