Weber – Fechner law relates Loudness (L) of the sound wave and the intensity (I) of the sound wave.

According to Weber-Fechner law, the loudness of a sound wave is proportional to the logarithm of its intensity.
(i.e.)       L α log I

\frac{\mathrm{d} \mathrm{L}}{\mathrm{d}-\mathrm{I}}=\frac{\mathrm{K}}{\mathrm{I}} called the sensitiveness of the ear.

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