Dual sound source

In the above diagram, a sound source producing a sound of frequency \(f\) is moving at a constant speed of \(v_s\) to the right (in the direction of the red arrow). Let \(f_A\) and \(f_B\) be the frequencies detected by the sound detectors \(A\) and \(B,\) respectively. What is the ratio \(f_A:f_B\)?

The speed of sound (\(v\)) in the air is \(340 \text{ m/s}\) and \(v > v_s\).

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