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The chief reason collection cannot start immediately after activation is that

  • A.newly activated droplets are far too small to collect
  • B.the supersaturation is too high at that stage
  • C.there are far too few droplets present to collide at all
  • D.the updraught speed is at its maximum there

Answer: A

Droplets a micrometre or two across have essentially zero collision efficiency. Diffusional growth must carry them to roughly twenty micrometres before collection becomes a productive route. That growth takes the greater part of the available time.

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