Electronic Devices

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

  1. each of these decreases
  2. each of these increases
  3. copper strip increases and that of germanium decreases
  4. copper strip decreases and that of germanium increases

Answer

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

The correct option is D.