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Decibel intensity ratio

dB = -10.00 dB

dB=10log⁡10(I/I0)=20log⁡10(A/A0)\mathrm{dB}=10\log_{10}(I/I_0)=20\log_{10}(A/A_0)

dB = 10 log₁₀(I/I₀) = 20 log₁₀(A/A₀). −3 dB is half intensity.

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