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[" An isotropic point source ' "S" ' of ...

[" An isotropic point source ' "S" ' of sound emits "],[" constant power.Two points "A" and "B" are situated "],[" at distance "x" and "2x" from "S" .The difference "],[" between the loudness of points "A" and "B" is about "],[(log2=0.3)],[[" (1) "3dB," (2) "2dB],[" (3) "6dB," (4) "12dB]]

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