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Sound: Loudness and Intensity

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The intensity at a distance of 6.0 m from a source that is radiating equally in all directions is 6.0 Ã- 10-10 W/m2. What is the intensity level in dB?

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Solution Summary

The relation between Intensity and loudness is established and loudness in dB is calculated.

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Intensity:
Intensity of sound is the amount of energy incident per unit area per unit time normal to surface. The unit of intensity is W/m2.
From a point source the emitted energy will distributed uniformly in all direction and will fall uniformly on a spherical surface with source at center. If a point source emitting power P, then at a distance r from the source the intensity will be
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