Planck's law ( by wavelength)
Planck’s law describes the electromagnetic radiation emitted from a black body at a certain temperature. Radiance and spectral radiance are measures of the quantity of radiation that passes through or is emitted from a surface and falls within a given solid angle in a specified direction.
Planckian spectral radiance can be measured by the wavelength of the radiation, as shown hereRelated formulas
|B(λ,T)||spectral radiance (W*sr-1*m-3)|
|c||Speed of light|
|T||absolute temperature (K)|