It is a cool video but is calling it a demonstration of resonace correct?
This is just a visualizing of the points of high and low vibration on the speaker surface and has nothing to do with matching the vibration of the sound to the natural vibrations of the rice. This is the equivelant of using iron shavings to visualize a changing magnetic field.
But the relevant physics classes are well behind me so maybe I'm misremembering.
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