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2. A speaker at one end of a hallway emits sound at a frequency of 28.0...

2. A speaker at one end of a hallway emits sound at a frequency of 28.0 kHz. If you walk down the hallway away from the speaker at a speed of 0.950 m/s, what is the beat frequency between the waves directly from the source and the waves reflected off the end of the hallway? Take the speed of sound to be 343 m/s.

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