TABLE II. Backscattered pressure amplitude relative to the incident pressure amplitude in units of 131026 for a 50-mm-diam spherical void immersed in sea water, calculated at 1000 m range for the analytical expressed solution and BEM, and scaled to 1000 m for the farfield Kirchhoff approximation. The effect o amplitude of the orientation of the subdivided icosahedron used to represent the void in the BEM and Kir approximation is expressed through the parenthetical quantity, which is the maximum percentage de from the mean observed over a wide range of axial orientations. Values in italics indicate that the mode nodal separation exceedingl/6 at the specified frequency.
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