Semiconductor Electronics Materials Devices and Simple Circuits - Result Question 51
52. A piece of copper and other of germanium are cooled from the room temperature to $80 K$, then
(a) resistance of each will increase
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(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: 52. (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.
