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:

  1. (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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