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Part of the interference effect is from the shape of the droplet. Oblate
is an approximate word, but a much better descriptor, like it or not, is
the top half of a hamburger bun. The bottom of a raindrop tends to be flat
because of the aerodynamic forces acting on it.
Don't forget that raindrops grow larger as they approach the ground
because of collection/coalescence. Bigger raindrops have a greater fall
speed than smaller ones, which get scooped up. Smaller raindrops are
rounder. So there's a lot of interesting physics in there.
Good observing,
Alister.
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Alister Ling watcher_at_freenet.edmonton.ab.ca
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Wherein the deep night sky
The stars lie in its embrace
The courtyard still in its sleep
And peace comes over your face
Loreena McKennitt
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