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(C) The resistivity of a conductor (like copper) is directly proportional to temperature. As the temperature decreases,the resistivity of copper decre

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Decrease in copper and increase in silicon

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(C) The resistivity of a conductor (like copper) is directly proportional to temperature. As the temperature decreases,the resistivity of copper decreases.Conversely,the resistivity of a semiconductor (like silicon) is inversely related to temperature because the number of charge carriers increases with temperature. As the temperature decreases,the number of free charge carriers decreases,causing the resistivity of silicon to increase.Therefore,when cooled from $300 \ K$ to $100 \ K$,the resistivity of copper decreases and the resistivity of silicon increases.

Silicon and copper are cooled from $300 \ K$ to $100 \ K$. What happens to their specific resistance (resistivity)?

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