Question

A piece of copper and another of germanium are cooled from room temperature

to 80K. The resistance of

A. copper increases, germanium decreases

B. copper decreases, germanium increases

C. each of them increases

D. each of them decreases

Answer 1

B) Copper decreases., germanium increases

Answer 2

Answer:

Explanation: is copper is a metal so in this case if temperature decreases the resistance also decreases but in the case of Germanium which is a semiconductor it conducts at high temperature and at lower temperature it becomes insulator which means resistance decreases. Which means that the correct answer is copper decreases and Germanium increases