Monday, 15 July 2019

acoustics - Can someone explain how water from a garden hose can propagate in a sine/cosine wave?


A video posted on Youtube.



How does this phenomenon work? I know he is using frequency to propagate water in a sine/cosine wave, but how does it exactly work this way? Why do we see it as if its paused, or in slow motion, or even in reverse?


Can someone please explain this? I am intrigued by the video and want to know it's physics.



Answer



It's a visual illusion akin to the Wagon Wheel effect


The stream of water is being waggled back and forth by a 25 Hz audio signal and being filmed at 25 frames per second.


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