A car is parked 19.0 m directly south of a railroad crossing. A train is approac

Question

A car is parked 19.0 m directly south of a railroad crossing. A train is approaching the crossing from the west, heading directly east at a speed of 50.0 m/s. The train sounds a short blast of its 315-Hz horn when it reaches a point 16.0 m west of the crossing. What frequency does the car's driver hear when the horn blast reaches the car? The speed of sound in air is 343 m/s. (Hint: Assume that only the component of the train's velocity that is directed towards the car affects the frequency heard by the driver.)

Explanation / Answer

I have used doppler effect formula..

The equation for the observed frequency of sound when the source is traveling toward you is:

fO = fSc/(c ? vS)

or

fO = fS/(1 ? vS/c)

where

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