I saw this video on “Videos I found on reddit” where this guy had salt or something on a table, and he had this thing he rubbed on the table that made a sound and moved the salt into a star like shape, then he used a different object that made a deeper tone that moved the salt back, can anyone explain this? If needed i can provide a link and timestamp
In: Physics
It sounds like you’re describing a Chladni plate. This is typically a metal plate with some dust on it, and by hitting the plate with sound (typically through an attached speaker) it is caused to vibrate.
As you might know when shaking a long stick or a pool noodle or something, some parts of the vibrating object move a lot and others can not move at all. The same applies to a vibrating plate. The parts that move a lot cause the dust to bounce around a lot and eventually bounce elsewhere. The parts that stay still don’t bounce the dust away, and so all of the dust slowly collects there. This forms dust patterns that mimic the parts of the plate that don’t move.
By adjusting the sound frequency, you can change the way that the plate vibrates, and so the parts that stay still, and so the dust patterns on its surface.
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