Rest your hands on a speaker playing loud music. Feel the sound vibrations? Now, you might want to adjust your volume for this one.
Sound frequencies produce a variety of increasingly intricate resonance patterns. And if you sprinkle sand or salt on a metal plate that is vibrating from these sound frequencies, you can see the patterns.
Science Friday has a great video that explains it super clearly. Highly recommended.
Related videos: more on frequency and Chladni patterns.
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