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photoflash
photoflood
photofluorogram
photofluorography
photog
photogenic
photogram
photogrammetry
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photographic magnitude
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photoelectric effect
pho·to·e·lec·tric ef·fect (plural pho·to·e·lec·tric ef·fects)


noun 
Definition:
 
electron emission caused by light: the emission of electrons from a substance exposed to electromagnetic radiation
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