Identify the correct statement among the foll | vedclass

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(C) When the temperature of a metal is increased,the atoms in it start to vibrate more rigorously. This leads to an increase in the number of collisio

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Resistivity of metals increases with temperature because number of collisions between electrons increases.

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(C) When the temperature of a metal is increased,the atoms in it start to vibrate more rigorously. This leads to an increase in the number of collisions between the electrons and the lattice ions. Thus,the average time between successive collisions,known as the relaxation time ' $	au$ ',decreases. The resistivity ' $ho$ ' of a metal is given by the formula: $ho = \frac{m}{n e^2 	au}$. Here,$m$ is the mass of an electron,$n$ is the number density of free electrons,and $e$ is the charge of an electron. Since $ho \propto \frac{1}{	au}$,as the relaxation time ' $	au$ ' decreases with increasing temperature,the resistivity ' $ho$ ' increases.

Identify the correct statement among the following.

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