A tornado warning siren at the top of a tall pole radiates sound waves uniformly

Question

A tornado warning siren at the top of a tall pole radiates sound waves uniformly
in all directions. At a distance of 10 [m], the intensity of sound is 0.49 [W/m2] .
What is the intensity at a distance of 70 [m] from the siren?

Explanation / Answer

at 10m I=0.49w/m2 at 70m, it will be 0.49/7^2 = 0.01W/m2 I at 70m = 0.01W/m2 How did i get it?-> Inverse square law In physics, an inverse-square law is any physical law stating that a specified physical quantity or intensity is inversely proportional to the square of the distance from the source of that physical quantity. http://upload.wikimedia.org/wikipedia/en/math/e/b/7/eb77801ec30f5f676a04c1a848694778.png

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