A wire of aluminium and a wire of germanium a | vedclass

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(D) Aluminium is a metal (conductor). For metals, the resistance decreases as the temperature decreases because the lattice vibrations (phonons) decre

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resistance of aluminium wire decreases and that of germanium wire increases

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(D) Aluminium is a metal (conductor). For metals, the resistance decreases as the temperature decreases because the lattice vibrations (phonons) decrease, leading to less scattering of electrons.Germanium is a semiconductor. For semiconductors, the resistance increases as the temperature decreases because the number of charge carriers (electrons and holes) decreases exponentially with temperature.Therefore, when cooled to $77 \,K$, the resistance of the aluminium wire decreases and the resistance of the germanium wire increases.

$A$ wire of aluminium and a wire of germanium are cooled to a temperature of $77 \,K$. Then

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