Silicon and copper are cooled from $300 \mathrm{~K}$ to $100 \mathrm{~K}$, the specific resistance…
Silicon and copper are cooled from $300 \mathrm{~K}$ to $100 \mathrm{~K}$, the specific resistance (resistivity)
increase in both copper and silicon
decrease in both copper and silicon
decrease in copper and increase in silicon
increase in copper but decrease in silicon
Solution
Resistivity of conductors increase with temperature and that of semiconductor decreases with temperature. When temperature is decreased, the resistivity of copper will decrease while that of silicon will increase.