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A spherical source of power 4 W and freq...

A spherical source of power `4 W` and frequency `800 Hz` is emitting sound waves. The intensity of waves at a distance `200 m` is

A

`8 xx 10^(-6) W//m^(2)`

B

`2 xx 10^(-4) W//m^(2)`

C

`1 xx 10^(-4) W//m^(2)`

D

`4 W//m^(2)`

Text Solution

Verified by Experts

The correct Answer is:
A
`I = (p)/(4 pi r^(2)) = (4)/(4pi (200)^(2)) ~= 8 xx 10^(-6) W//m^(2)`
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