Wires P and Q have the same resistance at ord | vedclass

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(D) The resistance of a conductor increases with an increase in temperature because the collision frequency of electrons with lattice ions increases.

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$P$ is conductor and $Q$ is semiconductor

Vedclass · Answer

(D) The resistance of a conductor increases with an increase in temperature because the collision frequency of electrons with lattice ions increases. Thus,conductors have a positive temperature coefficient of resistance.In contrast,the resistance of a semiconductor decreases with an increase in temperature because more charge carriers (electrons and holes) are generated due to thermal excitation,which increases the conductivity. Thus,semiconductors have a negative temperature coefficient of resistance.Since the resistance of $P$ increases with temperature,$P$ is a conductor.Since the resistance of $Q$ decreases with temperature,$Q$ is a semiconductor.Therefore,the correct option is $(d)$.

Wires $P$ and $Q$ have the same resistance at ordinary (room) temperature. When heated,the resistance of $P$ increases and that of $Q$ decreases. We conclude that:

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