Question

A piece of copper and another of germanium are cooled from room temperature to 77K. The resistance of ______.

विकल्प

• each of these decreases

• copper strip increases and that of germanium decreases

• each of these increases

• copper strip decreases and that of germanium increases

Answer 1

A piece of copper and another of germanium are cooled from room temperature to 77K. The resistance of copper strip decreases and that of germanium increases.

Explanation:

When the temperature drops, the resistance of copper (a conductor) falls while the resistance of germanium (a semiconductor) rises.