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Acoustics: Sound Fields, Transducers and Vibration, 2nd Edition by Tim Mellow, Leo Beranek

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2.10. Freely traveling spherical wave

Sound pressure

A solution to the spherical wave Eq. (2.25) is
p ˜ ( r ) = A ˜ + e j k r r + A ˜ e j k r r ,
image (2.134)
where A ˜ + image is the amplitude of the sound pressure in the outgoing wave at unit distance from the center of the sphere and A ˜ image is the same for the reflected wave. This equation can also be written ...

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