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how to figure out how many watts per square meter a stereo emits at 79 dB?

Suppose that when you turn on a stereo, the decibel level of the sound it emits is 79 dB. How many watts per square meter does the stereo emit?

See this, it may help:

http://en.wikipedia.org/wiki/Insolation

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New Noise Sound Level Digital Decibel dB Meter USB    US $135.99

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