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10 cards from this deck
Sound energy passing through unit area per second
W⋅m−2\text{W} \cdot \text{m}^{-2}W⋅m−2 (watts per square metre)
I∝1d2I \propto \frac{1}{d^2}I∝d21
One-quarter of original intensity
One-ninth of original intensity
I1I2=(d2d1)2\frac{I_1}{I_2} = \left(\frac{d_2}{d_1}\right)^2I2I1=(d1d2)2
Logarithmic scale
10−12 W⋅m−210^{-12} \text{ W} \cdot \text{m}^{-2}10−12 W⋅m−2 or 0 dB
Tenfold (10 times) increase in intensity
I=10(dB10−12)I = 10^{\left(\frac{\text{dB}}{10} - 12\right)}I=10(10dB−12)
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