Radiation spectrum
= Radiation spectrum
The distribution of emitted or received electromagnetic <power>, <radiative flux> or <specific intensity> across <frequency> or <wavelength>. The spectral quantity and interval convention must be specified: $F_\nu$ and $F_\lambda$ differ by the change-of-variable factor, while $\nu F_\nu$ gives energy flux per logarithmic frequency interval. This physical spectrum is distinct from the spectrum of a linear operator or a spectrum in topology.