
David Politzer, “The Physics of Banjos” (Open Agenda, 2021)
Ideas Roadshow Podcast
00:00
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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