Bathtub waterspout question ?

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Offline acecharly

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Bathtub waterspout question ?
« on: 08/04/2012 20:12:23 »
After taking a bath the other day I watched the water going down the spout (as you do  :D ) and i noticed something ive neve seen before. Aside fom the usual spiraling effect as the water flowed downed the spout the ceiling light created shadows of approximately 10-15 perfectly straight lines radiating out from the spiraling water.

Any ideas what this is and is this similar to how stars that orbit a galaxy rotate similar on the outside as they do close to the center unlike how our planets orbit our sun at longer durations depending how far out they are?

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Offline RD

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Re: Bathtub waterspout question ?
« Reply #1 on: 08/04/2012 22:18:45 »
... the ceiling light created shadows of approximately 10-15 perfectly straight lines radiating out from the spiraling water.

an interference effect of water waves (ripples) can cause what appears to be radial shadows ...


https://en.wikipedia.org/wiki/Ripple_tank
« Last Edit: 08/04/2012 22:50:29 by RD »

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Offline acecharly

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Re: Bathtub waterspout question ?
« Reply #2 on: 09/04/2012 11:27:19 »
Ahhhh ....Brilliant...!!!! never thought of that, great answer, finally ive observed my very own interference pattern.