Question

A strip of copper and another germanium are cooled from room temperature to 80K. The resistance of

(a) each of these decreases

(b) copper strip increases and that of germanium decreases

(c) copper strip decreases and that of germanium increases

(d) each of these increases.

Answer 1

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