Question

A piece of copper and another of germanium are cooled from room temperature to `80 K`. The resistance of
A. each of them increases
B. each of them decreases
C. copper increases and germanium decreases
D. copper decreases ad germanium increases

Answer 1

Correct Answer - D
Copper is metal and germanium is semiconduction Resistance of a metal decreases and that of a semiconductor increases with decrease in temperature
`:.` correct option is d.