_{0}and its observation point r are interchangeable. It can be seen ...

In the previous section we introduced the Green's function

$g\left(r|{r}_{0}\right)=\frac{{e}^{-jk\left(r-{r}_{0}\right)}}{4\pi \left(r-{r}_{0}\right)},$

(13.16)

which turns out to be a solution of the following inhomogeneous wave equation:

$\left({\nabla}^{2}+{k}^{2}\right)g\left(r|{r}_{0}\right)=-\delta \left(r-{r}_{0}\right).$

(13.17)

An important principle in acoustics is that of reciprocity whereby the locations of the sound source r
_{0} and its observation point r are interchangeable. It can be seen ...

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