which is introduced into Planck's function for the spectral brightness of a black body in order that it should more closely represent the spectrum of radiation coming from the surface. [P7.3]
of: a surface
is: a constant which is introduced into Planck's function for the spectral brightness of a black body in order that it should more closely represent the spectrum of radiation coming from the surface. [P7.3]
is useful: only over a specified range of wavelengths. [P7.3]
Copyright 1997, The Open University