MHT CET Physics question

Not in JEE Advanced syllabus

At absolute zero temperature, a crystal of pure germanium

(A)behaves as perfect conductor.
(B)behaves as perfect insulator.Correct
(C)behaves as a semiconductor.
(D)contains no electron.

Answer: (B)

Solution

At 0 K there is no thermal energy to lift electrons across the gap, so the valence band is full and the conduction band empty and the crystal behaves as a perfect

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Question ID VK-084998