Question: Light illuminates a metallic surface with a work function of 1.20 eV. It takes 1.6 V of retarding potential to stop all of the photoelectrons

Light illuminates a metallic surface with a work function of 1.20 eV. It takes 1.6 V of retarding potential to stop all of the photoelectrons from reaching the opposite plate. What is the maximum speed of the photoelectrons

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