Spherical waves are emitted from a 1.0 W...

Spherical waves are emitted from a `1.0 W` source in an isotropic non-absorbing medium. What is the wave intensity `1.0 m` from the source?

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Area of the sphere `=4pixx1^(2)=4pi`
`I ("intensity") =(1.00)/(4pi)W//m^(2)=8.0xx10^(-2) W//m^(2)`

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