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(A) The resistance of a conductor (like copper) is directly proportional to its temperature. As the temperature decreases,the resistance of copper dec

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copper decreases and germanium increases.

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(A) The resistance of a conductor (like copper) is directly proportional to its temperature. As the temperature decreases,the resistance of copper decreases.The resistance of a semiconductor (like germanium) is inversely proportional to its temperature because the number of charge carriers decreases significantly as the temperature drops. As the temperature decreases,the resistance of germanium increases.Therefore,when both are cooled from room temperature to $40 \ K$,the resistance of copper decreases and the resistance of germanium increases.

$A$ piece of copper and another of Germanium are cooled from room temperature to $40 \ K$. The resistance of . . . . . . .

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