The scattering of wide‐band ultrasonic pulses from a circular, cylindrical, fluid‐filled cavity in an elastic solid is investigated with a digital ultrasonic‐spectroscopy technique. Based on the data from three sizes of cavities (1/32‐in., 1/16‐in., and 1/8‐in. diameter), each being filled with five different fluids, we find that either the diameter of the cavity or the wave speed of the fluid contained in it can be determined from the time history of the scattered pulses. From the spectral analysis, an empirical formula is established relating the incremental spectral frequencies (the intervals between successive frequency maxima or minima of the spectra) to the diameter of the cavity and the wave speed of the fluid contained in it.

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