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YouTubeHarvard Natural Sciences Lecture Demonstrations
Acoustic Standing Waves and the Levitation of Small Objects
Acoustic levitation meets schlieren imaging: By reflecting a sound wave back onto itself, one can secure a standing wave if the distance between the source of the sound and the reflector is equal to an integral number of half wavelengths. In this demonstration we use 28 kHz ultrasound whose wavelength in air is 1.2 cm. The objects are small ...
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