Energy supplied to the edge of a semi‐infinite plate by a sinusoidal in‐plane force, uniform across the thickness, is found to be divided among the various propagating modes in such a manner that one type of mode receives most of the energy. Because the mode shapes change with frequency, the same mode is not dominant at all frequencies. The dominant mode, at any frequency, is that mode that most closely resembles the symmetrical Goodier‐Bishop wave having a dilatational portion independent of the thickness coordinate. Computations were performed over a range of frequencies, extending to frequencies where five propagating modes are involved, and graphs of results are presented.

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