19.In a photoemission experiment, the maximum kinetic energies of photoelectrons from metals P, Qand R are Ep, E and ER, respectively, and they are related by Ep = 2Eo = 2ER. In this experiment,the same source of monochromatic light is used for metals P and Q while a different source ofmonochromatic light is used for the metal R. The work functions for metals P, Q and R are 4.0 eV,4.5 eV and 5.5 eV, respectively. The energy of the incident photon used for metal R, in eV, is

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Answered: 19. In a photoemission experiment, the…

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