A piece of copper and another of germanium are cooled from room temperature to 77 K, the resistance of -

Options

A. each ot these decreases
B. each of them increases
C. of Cu decreases and Ge increases
D. of Cu increases and Ge decreases

Answer

B

Explanation

Resistance of conductors (Cu) decreases with decreases in temperature while that of semiconductors (Ge) increases with decreases in temperature.