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Science → Inventions and devices
ANSWERS: 1
  • locutus
    Noise-canceling headphones work using interference. A microphone on the earpiece monitors the instantaneous amplitude of the external sound wave, and a speaker on the inside of the earpiece produces a sound wave to cancel it. blatantly copy/pasted from a physics lecture: http://online.physics.uiuc.edu/courses/phys214/fall06/Lectures/Lect02.ppt
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