If copper and silicon are cooled from 300 , K | vedclass

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(A) Copper is a metal (conductor). For metals,the resistivity $\rho$ decreases as temperature $T$ decreases because the relaxation time increases. Sil

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decrease in copper but increase in silicon

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(A) Copper is a metal (conductor). For metals,the resistivity $\rho$ decreases as temperature $T$ decreases because the relaxation time increases. Silicon is a semiconductor. For semiconductors,the resistivity $\rho$ increases as temperature $T$ decreases because the number of free charge carriers decreases exponentially with temperature. Therefore,when cooled from $300 \, K$ to $60 \, K$,the resistivity of copper decreases and the resistivity of silicon increases.

If copper and silicon are cooled from $300 \, K$ to $60 \, K$,their resistivity will:

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