Copper and silicon is cooled from 300 K to 60 K, the specific resistance

Question

Copper and silicon is cooled from 300 K to 60 K, the specific resistance (A) decrease in copper but increase in silicon (B) increase in copper but decrease in silicon (C) increase in both (D) decrease in both.

Tardigrade Admin · Accepted Answer

The specific resistance or resistivity ,

ρ = ρ_{0} (1 + α T)

where

α =

temperature coefficient of resistivity is positive for metals (copper) and is negative for semiconductor ( silicon). Thus, when cooling , resistivity decreases in copper and increases in silicon.

Q. Copper and silicon is cooled from 300 K to 60 K, the specific resistance

decrease in copper but increase in silicon

increase in copper but decrease in silicon

increase in both

decrease in both.

The specific resistance or resistivity , ρ=ρ0​(1+αT) where α= temperature coefficient of resistivity is positive for metals (copper) and is negative for semiconductor ( silicon). Thus, when cooling , resistivity decreases in copper and increases in silicon.

The specific resistance or resistivity , $ρ = ρ_{0} (1 + α T)$
where $α =$ temperature coefficient of resistivity is positive for metals (copper) and is negative for semiconductor ( silicon). Thus, when cooling , resistivity decreases in copper and increases in silicon.