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(D) Copper is a metal (conductor). For metals,the resistance decreases as the temperature decreases because the collision frequency of electrons with

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Copper strip decreases and that of germanium increases

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(D) Copper is a metal (conductor). For metals,the resistance decreases as the temperature decreases because the collision frequency of electrons with lattice ions decreases.Germanium is a semiconductor. 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 the copper strip decreases and the resistance of the germanium strip increases.

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

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