Copper and silicon is cooled from 300 K to 60 K, the specific resistance (a) decrease in copper but increase in silicon (b) increase in copper but decrease in silicon (c) increase in both (d) decrease in both

Answer: (a). Copper is a metal ( α > 0): cooling lowers its resistivity. Silicon is a semiconductor ( α < 0): cooling reduces free carriers, so resistivity increases. So the answer is (a) decrease in copper but increase in silicon.

Copper and silicon is cooled from 300 K to 60 K, the specific… | NEET 2001 (AIPMT)

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Ohm's Law, Resistivity & Temperature

Copper and silicon is cooled from 300 K to 60 K, the specific resistance

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Answer: (a)

Copper is a metal ( $\alpha > 0$ ): cooling lowers its resistivity.
Silicon is a semiconductor ( $\alpha < 0$ ): cooling reduces free carriers, so resistivity increases.
So the answer is (a) decrease in copper but increase in silicon.

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