Si and Cu are cooled to a temperature of `300 K`, then resistivity

Si and Cu are cooled from 300 K to a temperative of 60 K. Then resistivity

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

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

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

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