photoelectric
related to the release of electrons from a surface in the process of lighting
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photometry
the scientific measurement of light in terms of its intensity, color, and other properties
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phosphorescence
a light that is released for a long period of time even after its source energy is gone or finished
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인광
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biennial
(of a plant) growing during the first year of its life, producing fruits or flowers and die in the second year
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