Resistivity of which of the following substan | vedclass

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(C) The correct option is $C$.Silicon is a semiconductor.In semiconductors,the number density of charge carriers (electrons and holes) increases expon

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Silicon

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(C) The correct option is $C$.Silicon is a semiconductor.In semiconductors,the number density of charge carriers (electrons and holes) increases exponentially with an increase in temperature.Although the relaxation time decreases with temperature,the increase in the number density of charge carriers dominates,leading to a decrease in resistivity as temperature increases.In contrast,metals like Copper,Aluminium,and alloys like Nichrome show an increase in resistivity with an increase in temperature.

Resistivity of which of the following substances decreases on increasing the temperature?

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