Question

Copper and Germanium are cooled from room temperature to $100\, K$. Then the resistance of

• A. Germanium decreases, Copper increases
• B. Germanium decreases, Copper decreases
• C. Germanium increases, Copper decreases
• D. Germanb m increases, Copper increases

Answer 1

Answer: (C)

Germanium increases, Copper decreases

Answer 2

The correct option is(C): Germanium increases, Copper decreases.

Resistance of conductor decreases while those of semiconductors increases on cooling.The change in resistance of a material with temperature is described by its temperature coefficient of resistance (TCR). TCR is positive for materials whose resistance increases with temperature, and negative for materials whose resistance decreases with temperature.