Direction of propagation of wave

  • Thread starter aseem
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  • #1
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Main Question or Discussion Point

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
 

Answers and Replies

  • #2
993
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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.
 
  • #3
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thank you. i got it :)
 

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