Answer:
Relaxation time \[(\tau )\]is inversely proportional to the velocities of electrons (e) and ions. The applied electric field produces an insignificant change in velocities of electrons at the order of 1m/s whereas the change in temperature T affects velocities at the order of \[{{10}^{2}}\,\,m\,/\,s.\] This decreases the relaxation time considerably in metals and consequently resistivity (\[\rho \]) of metal or conductor. \[\rho =\frac{M}{n{{e}^{2}}\tau }\] Where, \[n=\]electron density.
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