Most people are familiar with lasers. But what about a laser made with sound rather than light? A couple of physicists have now created one that they plan to use for measuring imperceivable forces.
Articles on Tractor beam
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From acoustic holograms to tractor beams.
A millimetre-sized object has been levitated and moved around in mid-air using nothing but sound waves.
You would normally expect objects that float in water to move in the same direction as waves. But now we can force floating objects to move in the opposite direction. This unexpected effect nicknamed a…
