Water and Sound Experiment

Have you guys never moved a hose up and down while running before? Pretty sure it's a similar concept, just the speaker vibrating the hose back and forth.
 
http://www.geek.com/articles/geek-cetera/sine-wave-water-illusion-20130313/

In this video, the vibrations from the speaker cause the tube to vibrate in a very specific pattern. This, in turn, causes the water to leave the tube in that same pattern. The different patterns captured here are a result of the tube vibrating at 23hz, 24hz, and 25hz while being captured on camera at 24fps. If you were to conduct this experiment yourself and you were just looking at the water with your eyes, you wouldn’t see the sine wave patterns that are captured by the camera. Our eyes capture the world at significantly faster than 24fps, so the camera serves as an interrupt that allows us to observe this optical illusion.
 
But how can water move backwards through a hose? Where's the new water coming from and how is the water source reversing ads well?
 
It's not actually going up into the tube....

You guys really shouldn't be that confused and amazed by this, it's pretty simple
 
Pardon my minimal physics knowledge, but I believe it is Wave Refraction, the process of a wave transferring from one medium to another medium, in this case I believe it is air to water, and then back to air.
 
He's definitely on the right track, don't know if thats the actual term though.Waves have a tendency to come into synchronized oscillation.

Like these metronomes, for example:

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Really not that hard to understand. The key is that he was filing at 24 frames per second and used a frequency of 24 Hz. If we looked at it we would see a blur, but since the frame rate is the same as the vibrations per second, the camera is in phase with the wave in the water, and is able to capture the standing wave pattern as a result.
 
It wouldnt look like that in real life obviously, just the fps of a camera matching up with frequencies of the woofer
 
the human eye sees in 23.8fps that is why movies are filmed at that frame rate. This guy is most likely filming at 60fps so that he can play it back at 24fps so it is in slow motion. but I agree with the rest of what you are saying.
 
Yes - but the air around the water is moving too. The sound travels through the air, the oscillation of the metronomes travels through the table.
 
Reminded me of Avatar.

tumblr_m7jb1rU2Jl1rbez76o1_500.gif
 
False the video is not in slow motion, listen to the sound, and when he focuses his camera. Not slow motion.
 
Uhhh, no. It's because he's generating a 25Hz wave as opposed to a 24Hz wave and he's still filming at 24Fps. If he were to film at 25Fps then the water would appear to float.

To the human eye, the stream would just be a blur and we wouldn't get to see the magical zig-zag patern that the water takes shape of.
 
Lol... Water is not going back up. It's vibrating in such a way that it looks like that, its somewhat of an optical illusion.

This is not that hard to wrap your head around.
 
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