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The terminal velocity of a small cloud droplet varies approximately as

  • A.the square root of its radius
  • B.the inverse of its radius
  • C.the square of its radius
  • D.the cube of its radius

Answer: C

Stokes drag balanced against weight gives a fall speed proportional to the square of the radius for droplets below about forty micrometres. Above that the relationship flattens and eventually approaches a square root dependence.

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