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A piece of copper and another of germanium are cooled from room temperature to 77 K, the resistance of

(a) each of them increases

(b) each of them decreases

(c) copper decreases and germanium increases

(d) copper increases and germanium decreases

1 Answer

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Best answer

Correct Option (c) copper decreases and germanium increases

Explanation:

We know that resistance of conductor is directly proportional to temperature. While resistance of semiconductor is inversely proportional to temperature

Therefore, it is clear that resistance of conductor decreases with decrease in temperature or vice-versa, while in case of semi-conductor, resistance increases with decrease in temperature or vice-versa.

Since, copper is pure conductor and germanium is a semiconductor, hence due to decrease in temperature, resistance of conductor decreases while that of semi-conductor increases.

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