Question: In a photoelectric - effect experiment, the maximum kinetic energy of electrons is 3 . 3 eV . When the wavelength of the light is

In a photoelectric-effect experiment, the maximum kinetic energy of electrons is 3.3
eV. When the wavelength of the light is increased by 50%, the maximum energy decreases to 1.5 eV. What is the work function of the cathode? What is the initial wavelength?

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