Acoustics: Sound Fields, Transducers and Vibration, 2nd Edition

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 ,

(2.134)

where A ˜ + is the amplitude of the sound pressure in the outgoing wave at unit distance from the center of the sphere and A ˜ − is the same for the reflected wave. This equation can also be written ...