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You illuminate a metal with light of wavelength 590 nm and find that the photoelectrons have...

You illuminate a metal with light of wavelength 590 nm and find that the photoelectrons have a maximum kinetic energy of 0.70 eV. You then illuminate the same metal with light of another wavelength and find a maximum kinetic energy of 1.9 eV for the photoelectrons.

What is the second wavelength, in nanometers?

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