A light source of wavelength lambda illuminates a metal and, Physics

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A light source of wavelength lambda illuminates a metal and

A light source of wavelength λ illuminates a metal and ejects photoelectrons with a max KE of 1.00eV, A second light source with half the wavelength of the first ejects photoelectrons with a max KE of 4.00eV. Obtain what is the work function of the metal?

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