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A piece of copper and other of germanium are cooled from the room temperature to 80 K, then

1. resistance of each will increase
2. resistance of copper will decrease
3. resistance of copper will increase while that of germanium will decrease
4. resistance of copper will decrease while that of germanium will increase

Correct answer: resistance of copper will decrease while that of germanium will increase

Solution

Copper is a metal, and its resistance decreases with a decrease in temperature due to reduced thermal vibrations of atoms. Germanium is a semiconductor, and its resistance increases as temperature decreases because fewer charge carriers are available at lower temperatures.

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