Abstract
The complex resonance frequencies of impenetrable (rigid or soft) elongated objects, namely, spheroids and cylinders with hemispherical end caps, including the spherical limit of the latter are studied. Complex resonance frequencies are obtained from the principle of phase matching of surface waves. For the case where such surface waves are generated by plane acoustic waves at broadside incidence, the simultaneous presence of cylindrical circumferential-wave resonances and of the resonances of meridionally propagating surface waves is discussed.
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