The normal modes of a standing wave are all just multiples of the fundamental frequency.
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Show the interference pattern between two point sources with the same frequency.
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Two cylinders with different densities are lowered into water to show Archimedes' Principle.
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A moving stream of air keeps a light ball suspended in mid-air, giving evidence for Bernoulli's equation.
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Two hemispheres fit together and pull apart easily until the air is sucked out from between them.
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