Relating to electrical effects or phenomena produced by or resulting from exposure to radiation or light energy.
From actino- (Greek aktis, 'ray') + electric (from elektron, 'amber'). Coined in the late 19th century to describe newly discovered effects of light on electrical conductivity and charge.
The actinoelectric effect was crucial for developing early television and camera technology—scientists realized that certain materials would release electrons when hit by light, which became the basis for image sensors and photomultiplier tubes used in night vision.
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