A peice of copper and the other of germa...

A peice of copper and the other of germanium are cooled from the room temperature to `80K`, then which of the following would be a correct statement?

A

Resistance of each increases

B

Resistance of each decreases

C

Resistance of copper increases while that of germanium decreases

D

Resistance of copper decreases while that of germanium increases

Verified by Experts

The correct Answer is:

D

As `T darr rho_(cu)darr` because Relaxation time `(tau)darr`
As `Tdarrrho_(Ge)uarr` due to less number free charge cariers .

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