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A physics student decides to try out some recently learned physics. She jumps on her bike...

A physics student decides to try out some recently learned physics. She jumps on her bike and rides 8.6 m/s towards a wall playing the fundamental frequency of a closed pipe whistle (length 4.2 cm). What beat frequency does the student hear? You may assume the speed of sound on this day is 344 m/s.

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