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A tiny vibrating source sends waves uniformly in all directions. An area of 3.25 cm2 on...

A tiny vibrating source sends waves uniformly in all directions. An area of 3.25 cm2 on a sphere of radius 2.50 m centered on the source receives energy at a rate of 4.20 J/s.
(a) What is the intensity of the waves at 2.50 m from the source and at 10.0 m from the source?
(b) At what rate is energy leaving the vibrating source of the waves?

(c) If the intensity received at a radius of 2.5 m was to drop by a factor of one half, what would be the change in energy output at the source?

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