A strip of copper and another of germanium are cooled from room temperature to 80 K. The resistance of (a) each of these decreases (b) copper strip increases and that of germanium decreases (c) copper strip decreases and that of germanium increases (d) each of these increases

Answer: (c). Copper (metal): cooling reduces collisions with the vibrating lattice, so resistance decreases. Germanium (semiconductor): cooling reduces carrier generation, so resistance increases. So the answer is (c).

A strip of copper and another of germanium are cooled from room… | JEE Main 2003 (AIEEE)

Q56JEE Main 2003 · AIEEEEasy

Intrinsic & Extrinsic Semiconductors

A strip of copper and another of germanium are cooled from room temperature to $80\text{ K}.$ The resistance of

Show answer and solution

Answer: (c)

Copper (metal): cooling reduces collisions with the vibrating lattice, so resistance decreases.
Germanium (semiconductor): cooling reduces carrier generation, so resistance increases.
So the answer is (c).

Report a mistake

Intrinsic & Extrinsic Semiconductors question from JEE Main 2003 (AIEEE)

More questions on Intrinsic & Extrinsic Semiconductors