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Physics, 03.12.2019 05:40

Aspeaker fixed to a moving platform moves toward a wall, emitting a steady sound with a frequency of 245 hz. a person on the platform right next to the speaker detects the sound waves reflected off the wall and those emitted by the speaker.

how fast should the platform move, vp, for the person to detect a beat frequency of 3.00 hz?

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