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 here

Related formulas


B(λ,T)spectral radiance (W*sr-1*m-3)
hPlanck constant
cSpeed of light
λwavelength (m)
kBBoltzmann constant
Tabsolute temperature (K)