A train of length \( l \) is moving with a constant speed \( v \) a...

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A train of length \( l \) is moving with a constant speed \( v \) along a circular track of radius \( \mathrm{R} \), The engine of the train emits a whistle of frequency \( f \). Find the frequency heard by a guard at the rear end of the train.
P Make suitable assumption.

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