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A siren emits sound isotropically with an average power of 100 W. What is the average...

A siren emits sound isotropically with an average power of 100 W. What is the average power detected by a person standing 10 m away? (total ears’ area 4 cm2)

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Answer #1

The relation between sound power (P) and intensity (I) of sound at a distance ' r ' is given by

  

is power generated by the source

In the given problem,

So, intensity of sound at a distance of 10 m from the source is

  

So, the average power detected by the person is

For any doubt please comment.

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