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Question on waves

  1. Sep 4, 2009 #1
    When you have a wave in sound inside a piston of length L, A.P. French says that the fundamenal frequency [tex]\nu[/tex] of an oscillation is given by

    [tex]\nu[/tex] = 1/4L [tex]\sqrt{(\gamma[/tex] p / [tex]\rho)}[/tex]

    Where p is the pressure, [tex] \gamma [/tex] is the factor that accounts for adiabatic compression of the gas, and [tex]\rho [/tex] is it's density.

    My question is this : doesn't the pressure p vary as you compress the gas? How can you assume it to be constant?
  2. jcsd
  3. Sep 5, 2009 #2
    Hold up. I think I got it. That's not ANY pressure that you plug in to that formula, it's the pressure when the gas is at equilibrium.
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