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Light with a wavelength of 2.0010-7 m is directed at a metallic surface made of ytrium, which has a work function of 3.11 eV. With

Light with a wavelength of 2.0010-7 m is directed at a metallic surface made of ytrium, which has a work function of 3.11 eV. With what speed will photoelectrons be produced, and what is the cut-off potential necessary to stop the photoelectrons

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