Question

A piece of copper and another of germanium are cooled from room temperature to 77K, the resistance of
(a) each of them increases
(b) each of them decreases
(c) copper decreases and germanium increases
(d) copper increases and germanium decreases.

Answer 1

(c) : Copper is a conductor Germanium is a semiconductor When cooled, the resistance of copper decreases and that of germanium increases.