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The maximum kinetic energy of the emitted electrons is found to be 1.255 eV when a...

The maximum kinetic energy of the emitted electrons is found to be 1.255 eV when a metal surface is illuminated by light with a wavelength of 400 nm. When the same metal surface is illuminated by light with a different wavelength, the maximum kinetic energy of the emitted electrons is found to be 0.634 eV. What is the wavelength of this light in nm?

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