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(D) Copper is a metal and germanium is a semiconductor. For metals,the resistance decreases as the temperature decreases because the collision frequen

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copper decreases and germanium increases

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(D) Copper is a metal and germanium is a semiconductor. For metals,the resistance decreases as the temperature decreases because the collision frequency of electrons with the lattice ions decreases. For semiconductors,the resistance increases as the temperature decreases because the number of charge carriers (electrons and holes) decreases exponentially with a decrease in temperature. Therefore,when cooled from room temperature to $80\, K$,the resistance of copper decreases and the resistance of germanium increases.

$A$ piece of copper and another of germanium are cooled from room temperature to $80\, K$. The resistance of :-

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