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ThreeDimensional Wave Equation
We have already seen that the onedimensional plane wave solution, (529), satisfies the onedimensional wave equation,

(536) 
where
is the characteristic wave speed of the medium through which the wave propagates. (See Section 7.2.)
Likewise, the threedimensional plane wave solution, (533), satisfies the threedimensional
wave equation (see Exercise 1),

(537) 
Richard Fitzpatrick
20130408