<P> The inverse - square law, in physics, is any physical law stating that a specified physical quantity or intensity is inversely proportional to the square of the distance from the source of that physical quantity . The fundamental cause for this can be understood as geometric dilution corresponding to point - source radiation into three - dimensional space (see diagram). </P> <P> Radar energy expands during both the signal transmission and also on the reflected return, so the inverse square for both paths means that the radar will receive energy according to the inverse fourth power of the range . </P>

What is intensity and how is it related to the amplitude of the wave and distance away from a source
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