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Discussion

Collection is described as a stochastic process because

  • A.individual collisions are discrete and randomly timed
  • B.the average collection rate cannot be calculated
  • C.collisions occur only under random supersaturations
  • D.droplet sizes are not measurable in principle

Answer: A

Averaging over the population hides the fortunate drops that collect several times early on. Those outliers are precisely the ones that reach precipitation size first and set the timing of rain. The tail of the distribution governs when rain appears.

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