Discussion
Which quantity does radar reflectivity depend on most strongly?
Answer: A
Rayleigh scattering gives a return proportional to the sixth power of diameter, so a single large drop returns as much as many small ones and the reflectivity is dominated by the largest particles. This is why converting reflectivity to rainfall rate is so uncertain, since the same reflectivity can arise from very different drop size distributions. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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