In the complex notation there is a clever device for finding the time average of a product. Suppose f(r, t) = A cos (k · r- ωt + δ_a) and g(r, t) = B cos (k · r- ωt + δ_b). Show that (f_g) = (1/2)R(), where the star denotes complex conjugation. [Note that this only works if the two waves have the same k and w, but they need not have the same amplitude or phase.] For example,

 

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Status NEW Posted 07 Jun 2017 06:06 AM My Price 3.00

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