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A piece of copper and a piece of germanium are cooled from room temperature to $80 \mathrm{~K}$. Then, which one of the following is correct?
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Resistance of copper will decrease while that of germanium will increase
Copper is a conductor and germanium is semiconductor. When both are cooled from room temperature to $80 \mathrm{~K}$. Then, resistance of copper will decrease while that of germanium will increase.
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