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Assuming the wave-fronts are spreading as the surface of a sphere centred on the source in a homogeneous, unobstructed medium, their amplitudes diminish as the square of the radius from the source.

In decibel terms the loss is 20 Log10(radius in metres) dB.

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Related Questions

What factors affect the intensity of an electromagnetic wave?

The intensity of an electromagnetic wave is affected by factors such as the amplitude of the wave, the frequency of the wave, and the distance from the source of the wave.


What is the relationship between the distance from a source of electromagnetic waves and the electromagnetic wave intensity at that distance?

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The distance or height of a vibration in a wave is called the amplitude. It represents the maximum displacement of a wave from its rest position. Amplitude is an important characteristic of a wave and affects its intensity and energy.


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The intensity increases by a factor of 4-APEX