The problem states:(adsbygoogle = window.adsbygoogle || []).push({});

A microphone in the ocean is sensitive to sounds emitted by popoises. To produce a usable signal , sound waves striking the microphone must have an intesity of 10.6 dB. If porpoises emit sound waves with a power of 0.0502 W, how far can a porpoise be from the microphone and still be heard? Disregard ansorbtion of sound waves by water.

I tried putting 10.6 decibels in the equation dB=10Log(I/Io)

and I solved for intensity to be 1.148E-10W/m^2

I then used that number in the I = P/4pi r^2 formula.

Solving for r I got 5.89E+3m.

But the right answer it the book is 1.87E+4

Can anyone tell me where I went wrong??

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# Sound intensity and ocean microphone

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