If pieces of copper and germanium are cooled | vedclass

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(C) Copper is a conductor (metal). For metals,resistance decreases as temperature decreases because the number of collisions between electrons and lat

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Decrease for copper and increase for germanium.

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(C) Copper is a conductor (metal). For metals,resistance decreases as temperature decreases because the number of collisions between electrons and lattice ions decreases.Germanium is a semiconductor. For semiconductors,resistance increases as temperature decreases because the number of charge carriers (electrons and holes) decreases exponentially with temperature.Therefore,when cooled to $77 \ K$,the resistance of copper decreases and the resistance of germanium increases.

If pieces of copper and germanium are cooled from room temperature to $77 \ K$,their resistance will:

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