A metal has a conduction charge density (n) of 20 × 1028

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A metal has a conduction charge density (n) of 20 × 10²⁸ electrons per cubic meter. What is the average (mean)
time (seconds) between the electron-ion collisions? The resistivity is 3 × 10–8 ohm-m— (Use an electron mass of 9 × 10^{– 31} kg and an electron charge of 1.6 × 10^{– 19} C)

1. 2 × 10^–15
2. 4 × 10^–15
3. 8 × 10^–15
4. 6 × 10^–15

Correct Option: C

NA