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Homework Help: Sounds Wave & Train Speed

  1. Apr 20, 2008 #1
    1. The problem statement, all variables and given/known data

    A train whistle sounds. As the train approaches, a stationary observer near the track hears the whistle at a frequency of 500 hertz. As the train recedes the observer hears the whistle at a frequency of 450 hertz. what is the speed of the train? v (sound) = 343 m/s

    2. Relevant equations

    Fa = f/(1-v(train)/Vs(Sound))
    Fr = f/(1+v(train)/Vs(Sound))

    3. The attempt at a solution

    Vtrain = 18.05
  2. jcsd
  3. Apr 21, 2008 #2
    I concur.
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