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Calculate open pipe length given resonance.

  1. Apr 25, 2012 #1
    1. The problem statement, all variables and given/known data

    What length of open pipe is needed to give resonance to a 384 Hz sound? Assume the speed of sound to 343 m/s.

    2. Relevant equations

    [tex]f=\frac{nv}{2l}[/tex]

    3. The attempt at a solution

    I am lost as to how to even start this problem.
     
  2. jcsd
  3. Apr 25, 2012 #2

    tiny-tim

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    welcome to pf!

    hi seker! welcome to pf! :smile:

    what is the (shortest) length (of an open pipe) needed to give a particular wavelength? :wink:
     
  4. Apr 25, 2012 #3
    This is what I have come up with so far.

    [tex](384)(l)=\frac{(1)(343)}{2}[/tex]

    l=9.45m
     
  5. Apr 26, 2012 #4

    tiny-tim

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    looks ok! :smile:

    (btw, do you understand why there's a "2" on the bottom, and would you be able to work it out for yourself in an exam if you couldn't remember the exact formula? :wink:)
     
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