JEE Main 2002 Physics question

At absolute zero, Si acts as

(1)non metal
(2)metal
(3)insulatorCorrect
(4)none of these

Answer: (3)

Solution

At 0 K, all electrons of an intrinsic semiconductor such as Si are in the valence band; none has thermal energy to cross the band gap (≈1.1 eV) into the conduction band. With a completely filled valence band

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Question ID VK-037909