Electrical effects or phenomena produced by the action of light radiation on matter, especially the generation of electric current when light strikes certain materials.
From actinoelectric + -ity (suffix from Latin -itas forming abstract nouns). This scientific term developed in the late 1800s as researchers studied the photoelectric effect and related phenomena.
Actinoelectricity was such a revolutionary discovery that Einstein won his Nobel Prize not for relativity but for explaining the photoelectric effect—proving that light carries energy in discrete packets called photons, which fundamentally changed physics.
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