Dictionary » U » Undulatory



moving in the manner of undulations, or waves; resembling the motion of waves, which successively rise or swell rise or swell and fall; pertaining to a propagated alternating motion, similar to that of waves.

(Science: optics) Undulatory theory, or wave theory (of light), that theory which regards its various phenomena as due to undulations in an ethereal medium, propagated from the radiant with immense, but measurable, velocities, and producing different impressions on the retina according to their amplitude and frequency, the sensation of brightness depending on the former, that of colour on the latter. The undulations are supposed to take place, not in the direction of propagation, as in the air waves constituting sound, but transversely, and the various phenomena of refraction, polarization, interference, etc, are attributable to the different affections of these undulations in different circumstances of propagation. It is computed that the frequency of the undulations corresponding to the several colours of the spectrum ranges from 458 millions of millions per second for the extreme red ray, to 727 millions of millions for the extreme violet, and their lengths for the same colours, from the thirty-eight thousandth to the sixty thousandth part of an inch. The theory of ethereal undulations is applicable not only to the phenomena of light, but also to those of heat.

Origin: Cf. F. Ondulatoire.

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A question about segmentation lengths in aquatic organisms

... segmentation in any aquatic organism follows a particular trend in terms of individual segment lengths? I have run some computer simulations of undulatory organisms composed of 5 segments and I have found that over a process of simulated evolution, there is a trend for segment 2 (segment 1 = ...

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by benhj
Wed Feb 25, 2009 5:47 pm
Forum: Zoology Discussion
Topic: A question about segmentation lengths in aquatic organisms
Replies: 1
Views: 2046

What type of creature is this?

Can you describe their swimming motion? Is it undulatory, using the thin part as a propeller, like a frog larva? You should catch one. Yes I know that's nasty, but you should catch it and keep it in a jar and observe it. This is pretty fascinating. ...

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by AstusAleator
Wed May 03, 2006 10:24 pm
Forum: Zoology Discussion
Topic: What type of creature is this?
Replies: 25
Views: 12113

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