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If some superballs are manufactured with varying grades of elasticity then it should be trivial to get a gradient bounce out of the correct drop setup. The superballs would all be the same size.
I'm am thinking a red superball, long wavelength, so the softest elasticity right through the rainbow colours
to a violet superball, short wavelength, with the strongest bounce.
A downward roll off a cliff edge onto a 45 degree plane would be a nice effect for 1000 or so mixed balls.
But what would be setup to get the rainbow out of a large height drop already bouncing mixture? Any suggestions? **
The impetus being, if the experiment is to drop 20,000 superballs from a helicopter for a demonstration to excite interest in science, why not add some of nature's quirks.
** maybe a big angled paraboloid. More science.
||Are you sure the strongest bounce will yield (or somehow
represent) the shortest wavelength?
||[pertinax] You are correct, the red colour has the widest, outside arc in photos of rainbows. True, the red , in a superball senario, would have to have the most elastic formula to make the highest bouncing arc.
||No metaphor, or representation will ever be complete because it it not the thing being described. Similar or intriguing is good enough to inspire.