wunderground.com By: Bailey Johnson Published: March 12, 2013
A falling stream of water turns into a zig-zaging, mind-bending illusion in this fascinating video. By strapping a tube to a speaker, and playing a specific frequency, the water appears to coil and snake to the ground. How does it work? Science!
More accurately, the frequency of the speaker syncs with the frame rate of the recording camera. Setting the camera to record 24 frames per second, and setting the speaker to play at 24 hertz, let's us see every sound wave travelling through the stream of water. By setting the speaker to 23 hz -- just slightly out of synch -- the water stream appears to move backwards. A frequency of 25 hz will give the impression of water lazily falling to the floor.
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