A small home speaker produces 0.200 ~/text{W}0.200 W of acoustical power. (This is achieved, for example, by a 10-Watt speaker operating at 2% electrical efficiency). If the speaker projects sound uniformly in all directions, what is the loudness of the sound (in dB) at a distance of 0.668 ~/text{m}0.668 m from the speaker?
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