what is the intensity definition of a source radiation
Specific (radiative) intensity is a quantity used in physics that describes electromagnetic radiation. It is a term used in much of the older scientific literature. The present-day SI term is spectral radiance, which can be expressed in base SI units as W mâ2 srâ1 Hzâ1.or the concept of specific intensity, the line of propagation of radiation lies in a semi-transparent medium which varies continuously in its optical properties.