In a conductor, if the number of conduction electrons per unit volume is 8.5x 1028 m3 and mean free time is 25 fs (femto second), it's approximate resistivity is (Take, m = 9.1x10-31 kg) (3) 10 Ω-m1 (c) 10-22-m (b) 10-52-m (d) 10-82-m
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