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interpretation 0_eng_final, single photoelectrons captured from the anode to give saturation current ∝ light flux, Energy balance equation h·v=L+Ec results in linear dependence on frequency of light, according to: Ec = h·ν-L, single photoelectrons vacuum "fly" with kinetic energy, Einstein based on light quantum considered as single particles, elctron escaping requires fulfilling of h·ν - L ≥ 0, Energy balance equation h·v=L+Ec was confirmed thanks to Millikan experiment, light quantum considered as single particles having Energy = h·ν, Threshold frequency ν ≤ L/h depends on material, elctron escaping requires overcoming of extraction work = L, Energy = h·ν is indipendent by light flux intensity