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In an intrinsic (pure) semiconductor at T > 0:

AOnly electrons
BNo charge carriers
COnly holes
DEqual number of electrons (in CB) and holes (in VB)
Answer & Solution
Correct answer: D. Equal number of electrons (in CB) and holes (in VB)
Thermal excitation promotes electrons from valence band to conduction band, leaving holes. n_e = n_h = n_i (intrinsic carrier concentration). Both contribute to conductivity.
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