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Direction of propagation of wave

  1. Nov 8, 2011 #1
    how to prove that a wave given as A.exp[i (wt - kx) ] is moving in positive x direction ?

    similarly, how to prove that a wave given as A.exp[i (wt + kx) ] is moving in negative x direction ?

    Thanks a lot
     
  2. jcsd
  3. Nov 8, 2011 #2
    let y = Aexp[i(wt - kx)].

    Consider a point with fixed displacement y. If t increases, x must increase also to keep y constant.

    But in y = Aexp[i(wt + kx)] to keep y constant as time t increses then x must decrease.
     
  4. Nov 8, 2011 #3
    thank you. i got it :)
     
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