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Physics, 16.09.2019 22:30 elijahjacksonrp6z2o7
Noise reduction headphones actively produce their own sound waves in order to cancel out external sound waves. a microphone in the headphones receives waves of one frequency. a loudspeaker in the headphones then produces a wave of that frequency but of a different phase. what is the phase difference between the external sound wave and the wave produced by the loudspeaker in the headphones? a. 90 b.180 c 270 d 360
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