Discussion
Assertion (A): Radar reflectivity is dominated by the largest drops in the sample volume.
Reason (R): Reflectivity scales as the sixth power of drop diameter in the Rayleigh regime.
Answer: A
Both are true and the reason gives the scaling, and doubling a drop's diameter multiplies its contribution by sixty four. A handful of large drops can outweigh many thousands of small ones. Reflectivity and rain rate are related only statistically.
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