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Amplitudes in a 2 part string

  1. Nov 17, 2003 #1
    I know that:
    yI(x,t) = AI sin [k1( x - v1t )]
    yR(x,t) = AR sin [k1( x - v1t )]
    yT(x,t) = AT sin [k1( x - v2t )]

    W1 = W2
    k1v1 = k2v2

    I am unsure about how to prove that AI = AT + AR
    Where AI, AT, and AR are the different amplitudes of the incident, transmitted, and reflected waves.
  2. jcsd
  3. Nov 18, 2003 #2


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    Science Advisor

    Basically, it's that "W1 = W2" which, I take it, is "conservation of energy". Do you know how to calculate the energy in a wave?
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