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Sound Waves Help

  1. Dec 6, 2006 #1
    1. The problem statement, all variables and given/known data
    A guitar string that is 85cm long is plucked. The fundamental frequency of the string is 350Hz. The string's tension is then increased and its wave speed is 1000m/s The string is vibrating at its fundamental frequency and a closed tube is next to it. A loud sound is produced by the tube. What are the possible lengths of the tube?

    2. Relevant equations
    speed = wavelength*frequency

    3. The attempt at a solution

    1000 = wavelength*frequency
    wavelength = 0.85(2) = 1.7
    1000 = 1.7*f
    f = 588.2

    I'm not sure what to do next. I know the speed of the wave inside the tube isn't going to be the same as its speed on the guitar string since they're different mediums, but I'm not sure what that speed would be.
  2. jcsd
  3. Dec 7, 2006 #2


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    Staff Emeritus
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    Gold Member

    If the sound isoud, what does that tell you about the frequency of the sound wave in relation to the fundamental frequency of the tube?
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