Semiconductor Electronics Materials Devices And Simple Circuits Ques 60
60. A piece of copper and other of germanium are cooled from the room temperature to $80$ $ K$, then
[1993]
(a) resistance of each will increase
(b) resistance of copper will decrease
(c) resistance of copper will increase while that of germanium will decrease
(d) resistance of copper will decrease while that of germanium will increase
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Answer:
Correct Answer: 60.(d)
Solution:
- (d) Copper is a conductor, so, its resistance decreases on decreasing temperature as thermal agitation decreases whereas germanium is semiconductor, therefore, on decreasing temperature resistance increases.
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