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Radar reflectivity in the Rayleigh regime is proportional to the sum of drop diameters raised to the power

  • A.six
  • B.three
  • C.two
  • D.one

Answer: A

The sixth power dependence means the largest drops dominate the return entirely. This is the root of the difficulty in converting reflectivity into a rainfall rate reliably. A single large drop can outweigh thousands of small ones.

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