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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

`8xx10^(-6)W//m^(2)`

B

`2xx10^(-4)W//m^(2)`

C

`1xx10^(-4)W//m^(2)`

D

`4W//m^(2)`

Text Solution

Verified by Experts

The correct Answer is:
A
Intensity `(I)=("Power")/("Area")=(4)/(4pi(200)^(2))`
`=7.9xx10^(-6)W//m^(2)`
`~~8xx10^(-6)W//m^(2)`.
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