Relationship Between Distance and Intensity (HSC SSCE Physics): Flashcards

Sound energy passing through unit area per second

$\text{W} \cdot \text{m}^{-2}$ (watts per square metre)

$I \propto \frac{1}{d^2}$

One-quarter of original intensity

One-ninth of original intensity

$\frac{I_1}{I_2} = \left(\frac{d_2}{d_1}\right)^2$

Logarithmic scale

$10^{-12} \text{ W} \cdot \text{m}^{-2}$ or 0 dB

Tenfold (10 times) increase in intensity

$I = 10^{\left(\frac{\text{dB}}{10} - 12\right)}$