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A light source of wavelength illuminates a metal and ejects photelectrons with a maximum kinetic energy of .

A light source of wavelength λ illuminates a metal and ejects photelectrons with a maximum kinetic energy of .73eV. A second light source with 1/2 the wavelength of the first ejects photoelectrons with a maximum kinetic energy  of 5.27eV. What is the work function of the metal?  

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