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Determining fundemental frequency from experiment

  1. Apr 14, 2013 #1
    1. The problem statement, all variables and given/known data

    An experiment was conducted with a string. the following successive harmonics were measured:
    46.9Hz, 53.7Hz, 61.9Hz, 70.9Hz

    a. Evaluate the fundemental frequency
    b. which harmonic corresponds to the 61.9Hz frequency?

    2. Relevant equations



    3. The attempt at a solution

    Well, on average the gaps between the harmonics are 8Hz, so it looks like they are all multiplies of 8Hz (on average). But I don't know if its a string with two fixed points or not, because the fundemental is different in each case.
     
  2. jcsd
  3. Apr 14, 2013 #2

    mfb

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    Why should it be different?
    8 Hz is the lowest resonance frequency of the string.
     
  4. Apr 14, 2013 #3
    You're right, but wouldn't that change the harmonic 61.9Hz belong to?
     
    Last edited: Apr 14, 2013
  5. Apr 14, 2013 #4

    mfb

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    I don't understand that question.
     
  6. Apr 14, 2013 #5
    61.9Hz is nth harmonic (first,second,third etc)
     
  7. Apr 14, 2013 #6

    mfb

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    If 8 Hz is the fundamental frequency, what is the frequency of the first harmonic? What is the frequency of the second harmonic? ...
     
  8. Apr 14, 2013 #7
    Sometimes I tend to over complicate things, thank you.
     
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