If Cu (Copper) and Ge (Germanium) are cooled | vedclass

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(B) $Cu$ is a conductor (metal). For metals,the resistance decreases as the temperature decreases because the lattice vibrations decrease.$Ge$ is a se

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The resistance of $Cu$ decreases and the resistance of $Ge$ increases.

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(B) $Cu$ is a conductor (metal). For metals,the resistance decreases as the temperature decreases because the lattice vibrations decrease.$Ge$ is a semiconductor. For semiconductors,the resistance increases as the temperature decreases because the number of free charge carriers (electrons and holes) decreases exponentially with temperature.Therefore,when cooled to $70 \ K$,the resistance of $Cu$ decreases and the resistance of $Ge$ increases.

If $Cu$ (Copper) and $Ge$ (Germanium) are cooled to $70 \ K$,then:

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