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What beat frequency would be heard by a tuba player in a marching band, of a...

What beat frequency would be heard by a tuba player in a marching band, of a note with a frequency of 4.50E2 Hz and the notes echo off a stationary building; if he is walking towards the building at a speed of 1.56 m/s, on a hot day with a temperature of 34.3 degC?

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