And if both absorption and scattering are important, we can define linear, atomic and mass extinction coefficients, using the symbol \(\kappa\), where All the foregoing equations are valid, whether we...And if both absorption and scattering are important, we can define linear, atomic and mass extinction coefficients, using the symbol \(\kappa\), where All the foregoing equations are valid, whether we use linear, atomic or mass absorption, scattering or extinction coefficients, and whether we refer to radiation integrated over all frequencies or whether at a particular wavelength or within a specified wavelength range.
