For the random collision process characterized by: t = average time between random collisions dt = probability of a collision in the short time dt: A) If t' = average time to the last collision (i.e., averaged over all possible time snapshots of an e-) use Pa, n+1 (t) d t = e-t/ = probability (the time between two collisions is between t and t + dt) B) Similarly, calculate the average time t" to the next collision. C) Drude thought of regular collisions spaced at t: 3t 4т 5t t' = t" so, t'+ t" = t 2 here +

For the random collision process characterized by: t = average time between random collisions dt = probability of a collision in the short time dt: A) If t' = average time to the last collision (i.e., averaged over all possible time snapshots of an e-) use Pa, n+1 (t) d t = e-t/ = probability (the time between two collisions is between t and t + dt) B) Similarly, calculate the average time t" to the next collision. C) Drude thought of regular collisions spaced at t: 3t 4т 5t t' = t" so, t'+ t" = t 2 here +