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A cloud droplet of 10 micrometres radius falls at about 1 centimetre per second. A droplet of 20 micrometres falls at roughly

  • A.2 centimetres per second
  • B.1 centimetre per second
  • C.8 centimetres per second
  • D.4 centimetres per second

Answer: D

Doubling the radius quadruples the fall speed while the Stokes regime holds. That widening gap in fall speed with size is exactly what makes larger droplets effective collectors. The advantage compounds as the collector continues to grow.

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