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physical object > artifact > device > instrument > optical device > detector > photoelectric device > photocathode

photocathode comparison table

Subject	has definition	is a kind of
photoelectric device	Any detector which uses the photoelectric effect to convert photons to electrons.	detector
photocathode	A thin metallic plate housed inside an evacuated tube capable of releasing electrons through the "photoelectric effect" when illuminated by light. These surfaces are best for optical and ultraviolet light.	photoelectric device

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