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A difference of 20 dB means the louder one is delivering 100 times as much power as the softer one is.
-- The power delivered by any sinusoidal phenomenon is usually proportional to the square of the amplitude. So the amplitudes would have to be in the ratio of 10 to 1. The louder one has 10 times the amplitude of the softer one.
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Nov 6th, 2015
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