Question

A piece of silver and another of germanium cooled from room temperature to 85K. Then the resistance of

(1) Each of then increases

(2) Each of then decreases

(3) That of silver increases and germanium decreases

(4) That of silver decreases and that of germanium decreases

Answer 1

(4) That of silver decreases and that of germanium decreases

Silver is a metal and germanium is a semi conductor. Resistance of metal decrease and that of a semi conductor increases with decreases in temperature.