Question

A piece of copper and the other of germanium are cooled from the room temperature to 80 K, then which of the following would be a correct statement

• A. Resistance of each increases
• B. Resistance of each decreases
• C. Resistance of copper increases while that of germanium decreases
• D. Resistance of copper decreases while that of germanium increases

Answer 1

The correct option is D

Resistance of copper decreases while that of germanium increases

Resistance of conductors (Cu) decreases with decrease in temperature while that of semi-conductors (Ge) increases with decrease in temperature.