Find the approximate total distance traveled by an electron in the time interval in which its displacement is one meter along the wire.

Explanation

`time=("displacement")/("drift velocity")=S/V_d`
`:.V_d=1 mm//s=10^-3m//s`
(normally the value of drift velocity is 1 mm/s)
S = 1 m
`time=1/10^-3=10^3m//s`
distance travelled = speed `xx` time
`:.` `speed=10^6m//s`
So required distance
`=10^6xx10^3m=10^9 m`