## 2.9. Freely traveling cylindrical wave

### Sound pressure

A solution to the cylindrical wave equation (2.23) is
$MathML$
(2.125)
where $MathML$ is the amplitude of the sound pressure in the outgoing wave at unit distance from the axis of symmetry and $MathML$ is the same for the reflected wave. H 0 (1) (x) and ...

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