![]() ![]() The destructive effect of an earthquake is palpable evidence of the energy carried in these waves. Calculate the intensity and the power of rays and waves.įigure 1.It is usually applied with the approximation of a point source, i.e., for observation distances which are much larger than the spatial extension of the light source, where the wavefronts are approximately spherical.Īt a distance from a source with radiant intensity, an area element with its normal direction towards the source receives an irradiance. This meaning is obviously quite different from that of intensities in optical physics. In radiometry, the radiant intensity is understood to be the radiant flux (or radiant power) per unit solid angle, which leads to units of W/sr (watts per steradian). Intensities in Radiometry Radiant flux per unit area or per unit solid angle – that detail makes a big difference! ![]()
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