Search Result for "action spectrum":
Wordnet 3.0

NOUN (1)

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



WordNet (r) 3.0 (2006):

action spectrum
    n 1: the efficiency with which electromagnetic radiation
         produces a photochemical reaction plotted as a function of
         the wavelength of the radiation