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A train of length l is moving with a con...

A train of length `l` is moving with a constant speed `upsilon` along a circular track of radius `R`. The engine of the train emits a sound of frequency `f`. Find the frequency heard by a guard at the rear end of the train.

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`nu_(s) = nu_(0) = nu`
Let `u` be the speed of sound.
then,
`f' = f ((u + nu_(0) cos theta)/(n + nu_(s) cos theta))`
`= f ((u + nu cos theta)/(n + nu cos theta))`
or `f' = f`
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