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Find the wavelength

  1. Mar 20, 2016 #1
    1. The problem statement, all variables and given/known data
    What is the wavelength of an 8cm closed pipe when it is sounding the 7th harmonic?


    2. Relevant equations
    L=λn/4
    3. The attempt at a solution
    L=(.08m*7)/(4)
    L=0.14m
    Am I correct?
     
  2. jcsd
  3. Mar 21, 2016 #2
    check your calculation-are you finding out the pipe length or wavelength?
     
  4. Mar 21, 2016 #3
    Wavelength
     
  5. Mar 21, 2016 #4
    Oh yeah wavelength, so is
    λ=4L/n
    λ=4(.08)/7
    Since is 7th harmonic.
    λ= .045m
     
  6. Mar 21, 2016 #5
    I think its correct!
     
  7. Mar 21, 2016 #6

    BvU

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    Seems a bit small to me. Is the pipe closed on both ends ? Can you check your relevant equation? Where does it come from ? Do you understand it ? Can you make a drawing ?

    [edit] I was mistaken. Your answer is right for a pipe that is closed on one end and open on the other.
     
    Last edited: Mar 21, 2016
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