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Homework Help: Doppler Effect frequency

  1. May 1, 2009 #1
    1. The problem statement, all variables and given/known data
    source emits sound with a characteristic frequency of 640 Hz. Calculate the observed frequency and the wavelength between source and observer in each of the following situations.
    a) The observer approaches a stationary source at 57 m/s
    b) Both the source and observer move towards each other at 28.5 m/s

    2. Relevant equations

    3. The attempt at a solution
    I already managed to calculate for the frequency: 747.29 Hz but can anyone explain to me how to find the wavelength because what i thought was that i could simply do 340/747.29 which is wrong..Help please!
    Last edited: May 2, 2009
  2. jcsd
  3. May 2, 2009 #2
    What are the situations? With the information given we can't do anything.
  4. May 2, 2009 #3
    my bad, no wonder no one was replying :P
  5. May 2, 2009 #4

    Doc Al

    User Avatar

    Staff: Mentor

    Since the source is stationary, the wavelength doesn't change.
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