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A train is traveling away from you at 120 km/h. It blows its whistle, and you hear a tone of 400Hz. Take the speed of sound to be 340 m/s. What is the actual frequency of the whistle?

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A train is traveling away from you at 120 km/h. It blows its whistle, and you hear a tone of 400Hz. Take the speed of sound to be 340 m/s. What is the actual frequency of the whistle?






 
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