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Describing electromagnetic radiation, why is there a second sin term?

  1. Apr 25, 2013 #1
    1. The problem statement, all variables and given/known data
    Hey all,
    I am working through a derivation that my professor gave me to do and I am having trouble understanding one of the formulas that he gave me, namely:

    "EM waves can be described as:
    E(x, t) = Eosin(2πx/λ)*sin(2πc/λ)"

    The the Eo*sin(2πx/λ) term makes sense to me. I am wondering why there is a second sin term (the sin(2πc/λ)) term in the equation. I understand that c/λ = f, but in that case I still don't really understand why this term is in here. Is there a source that derives this equation anywhere? I am having trouble finding a way to understand this equation.
    
     
  2. jcsd
  3. Apr 26, 2013 #2

    tiny-tim

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    hi daselocution! :smile:
    shouldn't there be a t in there somewhere? :confused:
     
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