Discussion
The narrowing of a droplet size spectrum during condensational growth arises because
Answer: D
Correct answer: small droplets grow faster in radius than large ones
Because \( \mathrm{d}r/\mathrm{d}t \propto 1/r \), a small droplet gains radius faster than a large one in the same environment, so the population converges and the spectrum narrows with height. That is the difficulty warm rain theory has to overcome: condensation actively works against producing the few large drops that collision and coalescence need.
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