Abstract
Very large amplitudes of the velocity and acceleration produced by a sound wave in water may be evoked by exposing thin laminae of the liquid to an airborne sound wave. In the case of water and air at atmospheric pressure and at a frequency of 10,000 c.p.s., the power advantage is shown to be a factor of about 3600 when the thickness of the lamina is small compared with 14 microns. On the other hand, the use of liquid laminae is ineffective when the effects desired depend on the pressure amplitude of the sound wave, as distinct from the velocity or acceleration. Sketches of an experimental arrangement are shown.
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