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Researchers at Aalto University have discovered a surprising phenomenon that changes how we think about how sound can move particles. Their experiment is based on a famous experiment recognisable from high school science classrooms worldwide—the Chlandni Plate experiment, where particles move on a vibrating surface. The experiment was first performed in 1787 by Ernst Chladni, who is now known as the father of acoustics. Chladni's experiment showed that when a plate is vibrating at a certain frequency, heavy particles move towards the regions with less vibration, called nodal lines. This experiment has been extensively repeated during the centuries since, and has shaped the common understanding of how heavy particles move on a vibrating plate. But researchers at Aalto University have now shown a case where heavy particles move towards the regions with more vibrations, or antinodes. "This is a surprising result, almost a contradiction to common beliefs," says Professor Quan Zhou.
The researchers installed a silicon plate on a piezoelectric transducer and submerged it into water. They spread sub-mm glass spheres on the plate, and vibrated the plate with signals of different frequencies, creating waves on the plate. The...
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