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A barking dog delivers abwat 1 mW of pow...

A barking dog delivers abwat 1 mW of power, which is uniformly distributed over a hemispherical area. The intensity of sound at a distance of 5 m is :

A

`0.04 mW//m^2 `

B

`3.19 mu W//m^2`

C

`12.74 mu W//m^2`

D

`6.37 mu W//m^2`

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