Classical Mechanics Level 5

Find the $$beat~frequency~detected~by~O~in~Hz$$.The source of sound and observer move with velocities of $$20~m/s~and~40~m/s$$ respectively in the same line. The frequency of the source emitting the sound is $$1000~ Hz$$.A wall is placed in front of the observer.

Details and Assumption

Take velocity of sound in air $$340~m/s$$

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