(Radio) -

Any point source which spreads its influence equally in all directions without a limit to its range will obey the inverse square law (entropy). This comes from strictly geometrical considerations. The intensity of the influence at any given radius r is the source strength divided by the area of the sphere. Being strictly geometric in its origin, the inverse square law applies to diverse phenomena. Point sources of gravitational force, electric field, light, sound or radiation (entropy) obey the inverse square law.

The energy twice as far from the source is spread over four times the area, hence one-fourth the intensity. Gravity, electricity, sound, light and radiation obey the Inverse Square Law.

Lp2 = Lp1 - 20 log(R2/R1)

where: Lp1 = Sound Pressure level in decibels at location 1

Lp2 = Sound Pressure level in decibels at location 2

R1 = distance from noise source to point 1

R2 = distance from noise source to point 2

(R1 and R2 must have the same units)

(image courtesy of HyperPhysics

The square-cube law (or cube-square law) is a principle, drawn from the mathematics of proportion, that is applied in engineering and biomechanics?. It was first demonstrated in 1638 in Galileo's Two New Sciences. It states:

See Also

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Last Modification: Monday 02 of May, 2011 04:49:45 MDT by Dale Pond. (Version 3)

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