A solution to the spherical wave Eq. (2.25) is

$\tilde{p}\left(r\right)={\tilde{A}}_{+}\frac{{e}^{-jkr}}{r}+{\tilde{A}}_{-}\frac{{e}^{jkr}}{r}\text{,}$

(2.134)

where
${\tilde{A}}_{+}$
is the amplitude of the sound pressure in the outgoing wave at unit distance from the center of the sphere and
${\tilde{A}}_{-}$
is the same for the reflected wave. This equation can also be written ...

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