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A piece of copper and another of germanium are cooled from room temperature to 80 K. The resistance of A. each of them increases B. each of them decreases C. copper increases and germanium decreases D. germanium increases and copper decreases

A piece of copper and another of germanium are cooled from room temperature to 80 K. The resistance of
A. each of them increases
B. each of them decreases
C. copper increases and germanium decreases
D. germanium increases and copper decreases

Grade:Upto college level

2 Answers

Saurabh Koranglekar
askIITians Faculty 10341 Points
one year ago
We know, a piece of copper is a metal while that of germanium is a semiconducting material.For metals resistance increases with increase intemperature.The semiconductor has a negative temperature coefficient of resistance. Hence, when it is cooled its resistance increases.
Vikas TU
14149 Points
one year ago

The resistance of a metal decreases with the decrease in temperature, whereas, in case of a semiconducting material resistance increases with decreases in temperature.

Therefore, when cooled, resistance of copper decreases and resistance of germanium increases.

The resistance of a metal decreases with the decrease in temperature, whereas, in case of a semiconducting material resistance increases with decreases in temperature.

Therefore, when cooled, resistance of copper decreases and resistance of germanium increases.

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