A microphone in the ocean is sensitive to sounds emitted by porpoises. To produce a usable signal, sound waves striking the microphone must have an intensity of 10.7 dB. If porpoises emit sound waves with a power of 0.0491 W, how far can a porpoise be from the microphone and still be heard? Disregard absorption of sound waves by the water.© BrainMass Inc. brainmass.com February 24, 2021, 2:11 pm ad1c9bdddf
Required intensity of sound (I) = 10.7 dB
Available power = 0.0491W
Let us say that the porpoise is at a distance 'x' such that it emits sound which produces the required intensity. ...
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