After a summary of some fundamental notions concerning the group velocity concept, we show how, in the field of acoustic scattering, this concept may be very useful for the interpretation of Regge trajectories. As a matter of fact, in Acoustics, it appears that the group velocity of a given surface wave is related to the frequency spacing between standing wave resonances for the same wave and also to the slope of its Regge trajectory. This same concept is useful in the interpretation of acoustic radiation. Finally, we present some remarks about the relationships between resonances, Regge trajectories and group velocity in nuclear physics and elementary particle physics

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