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A whistle of frequency 540 H(Z) rotates ...

A whistle of frequency `540 H_(Z)` rotates in a circle of radius `2 m`at a linear speed of `30 m//s` . What is the lowest and highest frequency heard by an observer a long distance away at rest with respect to the centre of circle ? Take speed of sound of sound in air as `330 m//s`. Can the apparent frequency be ever equal to actual ?

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