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Homework Help: Problem about Doppler effect

  1. May 7, 2010 #1
    1. The problem statement, all variables and given/known data
    a train moves with uniform velocity . its horn is with a definite frequency . then if the frequency that a man in the station had heard is changed from 5400 Hz to 4500 Hz . calculate :-
    1- velocity of train.
    2- the real frequency of the source .
    let the velocity of sound in air = 330 m/s .

    2. Relevant equations

    3. The attempt at a solution
    f'/f = v/(v+vs)
    vs = velocity of train = 63 m/s .
    is that solution is true ?
    and i can't solve or understand the second item of my problem .
    please i want a help .
  2. jcsd
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