Sound waves can be used to levitate and move objects, study says (frequency)

[phoenixmike11]

Sound waves can be used to levitate and move objects, study says - The Washington Post

wow-pretty cool stuff

[Tek_Freek]

Very cool!

Great for humans, but it should tick off every dog for a radius of a few miles...

They took advantage of the fact that the frequency of sound — the physical property that gives it a pitch — also matters. Using 24,000 hertz (Hz), a level comparable to a dog whistle, they were unaffected by the noise. The upper range of human hearing is about 20,000 Hz.