a standing observer perceives a train whistle to have a frequency of 300 hz. if the train is moving towards the observer at a velocity of 25 m/s, what is the frequency of the sound waves emitted from the train? assume the speed of sound is 300 m/s.

By using dopplers effect we can calculate that The frequency of the sound waves emitted from train is 275 m/s.As we have from dopplers effect of the sound ,f  = [tex]\frac{f_{0} V}{V-V_{s} }[/tex]Sound waves travels in the form of wave and its speed is 300m/s. Here the air should be dry.from question, we have f = 300 Hz[tex]f_{0}[/tex] = ?V = 300 m/sVs = 25 m/sputting appropriate values, we get300  =  [tex]\frac{f_{0} *300}{300-25}[/tex][tex]f_{0}[/tex] = 275 HzHence we can say that frequency of the sound waves emitted from the train is 275 Hz.To learn mor eon Doppler's effect, visit herehttps://brainly.com/question/28106478#SPJ4