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PE history by Mihai vers_2_rev, Neutral became Positive, Photoelectric Effect was studied by Wilhelm Hallwacs (1888), Einstein (1905) hypothesized corpuscolar nature of light, A Zn plaque behaved differently if being Neutral, Negative became Neutral, Lenard (1902) studied energy of photoelectrons, Stoletov he iluminated A condenser, Photoelectric Effect explicated by Einstein (1905), corpuscolar nature of light was confirmed by Millikan's experiments (1916), Photoelectric Effect was discovered by Heinrich Hertz (1887)