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| electric eye |
see "photoelectric cell." |
| photodiode |
a device consisting of a semiconductor sensitive to light that functions as a photoelectric cell. |
| selenium |
a chemical element that has thirty-four protons in each nucleus and that forms compounds with many other elements, but that can be isolated in gray or red crystalline allotropes whose electrical resistance varies with light intensity, leading to extensive use in photoelectric cells, xerographic copying, and the like. (symbol: Se) |
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