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Why frequency stays the same during transmission and reflection

  1. Jan 6, 2013 #1
    Why does frequency of a wave stay the same during transmission and reflection?
     
  2. jcsd
  3. Jan 6, 2013 #2

    mfb

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    Everything has a fixed phase relation - if one cycle is incoming every period T, everything advances by 1 cycle during this time. Reflection and transmission do not "add" or "remove" oscillations.
     
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