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The intensity of sound from a point sour...

The intensity of sound from a point source is `1.0 xx 10^-8 Wm^-2`, at a distance of 5.0 m from the source. What will be the intensity at a distance of 25 m from the source ?

Text Solution

Verified by Experts

The correct Answer is:
`4.0 xx 10^(-10)W//m^(2)`
For a poin source we use
`I = (P)/(4pix^(2))`
`I_(1)x_(1)^(2) = I_(2)x_(2)^(2)`
`I_(2) = (I_(1) x_(1)^(2))/x_(2)^(2)`
= =`(10^(-8) xx 25)/(625) = 4 xx 10^(-10) W//m^(2)`
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