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the efficiency with which electromagnetic radiation produces a photochemical reaction plotted as a function of the wavelength of the radiation

the distribution of energy as a function of frequency for a particular sound source

the spectrum of electromagnetic radiation that has passed through a medium that absorbed radiation of certain wavelengths

the spectrum of electromagnetic radiation that has passed through a medium that absorbed radiation of certain wavelengths

a dark band in the spectrum of white light that has been transmitted through a substance that exhibits absorption at selective wavelengths