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Why sand on a vibrating plate draws pictures: Chladni figures
Sprinkle sand on a thin metal plate, draw a violin bow along its edge, and the sand leaps into sharp, symmetrical lines. Change the pitch and the picture…
Why some notes sound sweet together and others seem to fight
Play C and E together and they sound sweet. Play C and C sharp and they buzz. The notes aren't the problem: the clash only happens when they meet. Every…
Why two almost-in-tune notes throb, and how tuners use the wobble
Play two notes that are almost in tune and you hear one note that swells and fades: wah-wah-wah. Neither string is wobbling. The throb, called a beat, appears…