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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 intesity `1.0 m` from the source?

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`1/(4pi) watt //m^2`
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AAKASH SERIES-WAVE MOTION AND SOUND-PROBLEMS (LEVEL - II)
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