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Homework Help: Frequency and velocity

  1. Dec 2, 2009 #1
    1. The problem statement, all variables and given/known data

    George and Martha are at a NASCAR race and as the race car made the turn to their right and rushed towards them the frequency they heard was F0 = G5 or 821 Hz. However, after it passed the frequency dropped to F0/2. The direction the cars are traveling is the +x axis, what is the velocity of the race car?

    2. Relevant equations

    Wave velocity = frequency x wavelength
  2. jcsd
  3. Dec 2, 2009 #2


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    Science Advisor
    Homework Helper

    Not the right equation - you are looking for the velocity of the car, not the sound.
    Do you know about Doppler shifts?
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