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A student runs down the hallway of the school at a speed of Vstudent = 3.2 m/s, carrying a ringing 826-Hz tuning fork toward a

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A student runs down the hallway of the school at a speed of Vstudent = 3.2 m/s, carrying a ringing 826-Hz tuning fork toward a concrete wall. The wall reflects the sound. The speed of sound is v = 343.m/s. What is the beat frequency ( in Hz) heard by the student? Enter a number with one digit behind the decimal point

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