Abstract
Theories for the acoustic radiation force on an object in a standing wave are complex—involving Bessel functions, complex integrations, and a bunch of cancelling terms. What is lost in the mathematics is a simple physical picture of the forces involved. For the case of the acoustic wavelength much larger than the object, this physical picture can be retrieved as the sum of results for simple elementary phenomena of fluid mechanics. And the result is the same as the comprehensive theory in the long wavelength limit. This physical approach will be presented. [Work supported by the Office of Naval Research, Physics Program.]
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