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A whistle of frequency 540 Hz rotates in...

A whistle of frequency 540 Hz rotates in a circle of radius 2 m at an angular speed of `15rads^(-1)`. What is the lowest and highest frequency heard by a listener a long distance away at rest with respect to centre of the circle ? Can the apparent frequecny be ever equal to the actual frequency? Take `V=330ms^(-1)`.

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