# Physics

A tiny source emits sound uniformly in all directions. The intensity level ar a dist. Of 2m is 100dB. How much sound power is the soure emitting?

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1. db = 10*Log W/Wo = 100
10*Log W/10^-12 = 100
Log W/10^-12 = 10
Log W - Log 10^-12 = 10
Log W = 10 + Log 10^-12 = 10-12 = -2
W = 10^-2 = 0.01 Watts.

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posted by Henry

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