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David Politzer, “The Physics of Banjos” (Open Agenda, 2021)

Ideas Roadshow Podcast

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The Coupled Oscillator in Quanta Mechanics

In a musical instrument, the beat can go up and down or sideways. This is called level repulsion in quanta mechanics. If you start at doing one, after a while it's typically doing another. By the time you're done, instead of having two with exactly the same frequency, you always end up with two different frequencies.

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