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During the photoelectric experiment, the stopping voltage resulted in maximum electron KE of 1.7 eV. If the work function of the cathode is 3.2 ev,

During the photoelectric experiment, the stopping voltage resulted in maximum electron KE of 1.7 eV. If the work function of the cathode is 3.2 ev, what is the wavelength of the light source used for the experiment? Provide your answer in nanometers, and round off to the nearest nanometer.

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