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A railroad train is travelling at 30 m//...

A railroad train is travelling at `30 m//s` in still air. The frequency of the note emitted by the node emitted by the locomotive whistle is `500 H_(Z)`. What is the wavelength of the sound waves : (a) in front of the locomotive?
What is the frequency of the sound heard by a stationary listener (b) behind the locomotive? (c) in front of the locomotive ?
Speed of sound in air `344 m//s`. (d) behind the locomotive ?

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