Find the relaxation time for free electr...

Find the relaxation time for free electrons in copper, if the density of mobile electrons in copper, if the density of mobile electrons is `8.4 xx10^(28) m^(-3)`. The resistivity of copper at room temperature is `1.7xx10^(-8)Omega m`.
Given : mass of electron `=9.11 xx10^(-31) kg ` and charge on electron `=1.6xx10^(-19)C`.

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