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Time Interference: Beats?

  1. Feb 28, 2013 #1
    So my textbook says that the equation for the frequency of beats is [itex]|{ f }_{ 1 }-{ f }_{ 2 }|[/itex] and the equation for effective frequncy is [itex]\frac { { f }_{ 1 }+{ f }_{ 2 } }{ 2 } [/itex], but what is frequncy of beats and effective frequency anyways?

    Edit: Opps. Should've posted it here: https://www.physicsforums.com/forumdisplay.php?f=61
     
  2. jcsd
  3. Feb 28, 2013 #2

    ehild

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    See:
    http://hyperphysics.phy-astr.gsu.edu/%E2%80%8Chbase/audio/sumdif.html#c1 [Broken]

    ehild
     
    Last edited by a moderator: May 6, 2017
  4. Mar 1, 2013 #3
    Thanks for the that! But what is effective frequency? The superimposed wave looks weird like this: http://hyperphysics.phy-astr.gsu.edu/%E2%80%8Chbase/sound/imgsou/beat4.gif [Broken]

    So is the effective frequency the frequency of the wave in the dotted line or the solid line?
     
    Last edited by a moderator: May 6, 2017
  5. Mar 1, 2013 #4

    ehild

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    The solid line.

    ehild
     
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