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- A piece of copper and another of germanium are cooled from room temperature to 77 K, the resistance of Option: 1 Each of them increases
A piece of copper and another of germanium are cooled from room temperature to 77 K, the resistance of
Each of them increases
Each of them decreases
Copper decreases and germanium increases
Copper increases and germanium decreases
Answers (1)
We know that resistance of conductor is directly proportional to temperature (ie, ), while resistance of semiconductor is inversely proportional to temperature \left(i e,
).
Therefore, it is clear that resistance of conductor decreases with decrease in temperature of vice-versa, while in case of semiconductor, resistance increase with decrease in temperature of 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 semiconductor increases.
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