Indirectly asked everything

Find the beat frequency detected by O (\(\in \text{Hz}\)).The source of sound and observer move with velocities of \(20\text{ m/s}\) and \(40\text{ m/s}\), respectively in the same line. The frequency of the source emitting the sound is \(1000\text{ Hz}\).

Note that a wall is placed in front of the observer.

Take velocity of sound in air \(340\text{ m/s}\).

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