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Trains Frequency of Sound

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A train is approaching a station and blows its horn with a frequency of 200hz. If the train has a speed of 25 m/s and the speed of sound is 350 m/s, what is the frequency of sound heard by the people standing on the platform

a. 190hz
b. 186hz
c. 210 hz
d. 200hz

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https://brainmass.com/physics/sound-hearing/trains-frequency-sound-41575
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