Silicon and copper are cooled from 300 K to 100 K, the specific resistance (resistivity) (a) increases in both copper and silicon (b) decreases in both copper and silicon (c) decreases in copper and increases in silicon (d) increases in copper and decreases in silicon

Answer: (c). Copper (metal): on cooling, lattice vibrations reduce, collisions fall, so resistivity decreases. Silicon (semiconductor): on cooling, fewer electrons cross the band gap, carrier number falls, so resistivity increases. So the answer is (c) decreases in copper and increases in silicon.

Silicon and copper are cooled from 300 K to 100 K, the specific… | MHT CET 2021 (20 Sep, Shift 1)

Q40MHT CET 2021 · 20 SEP · SHIFT 1Medium

Intrinsic & Extrinsic Semiconductors

Silicon and copper are cooled from 300 K to 100 K, the specific resistance (resistivity)

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Answer: (c)

Copper (metal): on cooling, lattice vibrations reduce, collisions fall, so resistivity decreases.
Silicon (semiconductor): on cooling, fewer electrons cross the band gap, carrier number falls, so resistivity increases.
So the answer is (c) decreases in copper and increases in silicon.

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Intrinsic & Extrinsic Semiconductors question from MHT CET 2021 (20 Sep, Shift 1)

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