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The drop size distribution of rain is most commonly represented by

  • A.a linear increase with drop diameter
  • B.a distribution with no drops below one millimetre
  • C.an exponential function of drop diameter
  • D.a uniform distribution across all sizes

Answer: C

The Marshall Palmer form expresses drop number as decaying exponentially with diameter. Gamma distributions with an extra shape parameter are now often preferred for their greater flexibility. The choice of form affects the derived rainfall appreciably.

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