DescriptionConstruction of wave elements in ship wave problem.svg
English: Envelope of the disturbance emitted at successive times, fig 12.2 p.409 of G.B. Whitham (1974) Linear and Nonlinear Waves (John Wiley & Sons Inc., 1974). Psi is the angle between the motion of the wave source and the direction of wave propagation (the wave vector k), and the circles represent wavefronts.
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