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The work function of potassium metal is 2.30 eV. Monochromatic light is shined on its surface,...

The work function of potassium metal is 2.30 eV. Monochromatic light is shined on its surface, and photoelectrons with a maximum speed of 5.50E5 m/s are ejected. What is the wavelength of the light?

539 nm
657 nm
393 nm
157 nm
1443 nm
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