Discussion
Assertion (A): The slope of the Marshall Palmer distribution changes with rainfall rate.
Reason (R): Heavier rain contains proportionally more large drops, which flattens the decay.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. The slope parameter falls as the rainfall rate rises, so the exponential decays more gently and large drops are relatively more numerous. That is what allows a radar to infer a rainfall rate from reflectivity at all, since the two are related through the assumed spectrum.
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