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Find the mean free path of the electron in the copper metal at 20 degrees Celsius.
The resistivity of copper at 20 degrees Celsius is 1.69x10* -m and the concentration
of free electrons in the copper is 8.5x10 m².
(a) 2.86 nm
(b) 2.24 nm
(c) 3.34 nm
(d) 1.98 nm

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