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Speed of wave on guitar string

  1. Sep 27, 2014 #1
    1. The problem statement, all variables and given/known data
    A 65-cm guitar string is fixed at both ends. In the frequency range between 1.0 and 2.0 kHz, the string is found to resonate only at frequencies 1.2, 1.5, and
    1.8kHz .

    What is the speed of traveling waves on this string?

    2. Relevant equations
    f = v/2l

    3. The attempt at a solution

    Each one of these is a multiple of .3 so i think that is the fundamental frequency. Then I use f=v/2l or
    v=2lf
    v= 2 * .65 * .3
    v = .39

    but i did it wrong. can someone help please
     
  2. jcsd
  3. Sep 28, 2014 #2
    Check your units. You need to convert kHz to Hz in order to come up with a velocity in m/s.
     
  4. Sep 28, 2014 #3
    What does "l" mean in that equation? And where does the equation come from?
     
  5. Sep 28, 2014 #4
    oh wow cant believe i missed that. thank you
     
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