A Tiny Vibrating Source Sends Waves Uniformly in All Directions

question 12

Essay

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?

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