Question
Physics Question on Semiconductor electronics: materials, devices and simple circuits
A piece of copper and other of germanium are cooled from the room temperature to 80 K, then
A
resistance of each will increase
B
resistance of copper will decrease
C
the resistance of copper will increase while that of germanium will decrease
D
the resistance of copper will decrease while that of germanium will increase
Answer
the resistance of copper will decrease while that of germanium will increase
Explanation
Solution
Copper is a conductor so its resistance decreases on decreasing temperature as thermal agitation decreases whereas germanium is semiconductor which on decreasing temperature resistance increases.