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A cathode that emits electrons when illuminated
Answer for the clue "A cathode that emits electrons when illuminated ", 12 letters:
photocathode
Word definitions for photocathode in dictionaries
Wikipedia
Word definitions in Wikipedia
A photocathode is a negatively charged electrode in a light detection device such as a photomultiplier or phototube that is coated with a photosensitive compound. When this is struck by a quantum of light ( photon ), the absorbed energy causes electron ...
Wiktionary
Word definitions in Wiktionary
n. (context physics English) A cathode that emits electrons when exposed to light
WordNet
Word definitions in WordNet
n. a cathode that emits electrons when illuminated