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21. please help 21. Your friend rides a bicycle toward you at a speed of 10.3 m/s while whistling a note with a frequency of

21. please help

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21. Your friend rides a bicycle toward you at a speed of 10.3 m/s while whistling a note with a frequency of 548 Hz. Taking the speed of sound to be 340 m/s, you will hear this note at a frequency of (Record your answer in the numerical-response section below ) Your

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