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The Hocking limit refers to

  • A.the highest supersaturation attainable within a natural cloud
  • B.the fastest terminal velocity of a raindrop
  • C.a collector radius below which collision efficiency vanishes
  • D.the maximum size a raindrop may attain

Answer: C

Correct answer: a collector radius below which collision efficiency vanishes

Below about eighteen to twenty micrometres a collector has too little inertia relative to the flow around it, and droplets are carried past rather than striking it. Collection therefore cannot begin until some droplets have reached that size by condensation, which is why the two growth mechanisms operate in sequence rather than together.

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