Discussion
Assertion (A): Radar rainfall estimates use different coefficients for convective and stratiform rain.
Reason (R): The two regimes have systematically different drop size distributions.
Answer: D
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason is why the practice is necessary. Radar measures reflectivity, which weights drop diameter to the sixth power, while rain rate weights it to roughly the third - so converting one to the other depends on the drop size distribution. Convective rain has fewer, larger drops and stratiform rain more numerous, smaller ones, so a single relationship applied to both introduces systematic error.
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