How do noise-cancelling headphones cancel sounds?
When using noise-canceling headphones, the unwanted sounds are canceled out by creating an opposing sound wave to the one you want to eliminate.
It means that when one sound wave is at its highest peak, the other is at its lowest, canceling each other out.
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In 1910, Nathaniel Baldwin invented headphones. A prototype was sent to Lt. Comdr. A. J. Hepburn of the U.S. Navy. Hepburn tested the device and found it worked unexpectedly well to transmi...