GCEPhysicsElectronics2024

In an intrinsic semiconductor at absolute zero temperature (0 K), the material behaves as

Aa perfect conductor because all electrons are free
Ba perfect insulator because all electrons are in the valence bandCORRECT
Ca superconductor due to zero resistance
Da p-type material because holes dominate
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Why the answer is B, and why the others tempt you.
At absolute zero (0 K), all electrons in an intrinsic semiconductor occupy the valence band and there is no thermal energy to excite electrons across the band gap into the conduction band. With no free charge carriers available, the material behaves as a perfect insulator. As temperature increases, electron-hole pairs are thermally generated and conductivity increases.
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