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A light source of wavelength lambda illu...

A light source of wavelength `lambda` illuminates a metal and ejects photoelectron with `(KE)^(max) = 1 eV.`
Another light source of wave length `(lambda)/(3),` ejects
photoelectrons from same metal with `(KE)^(max)=5 eV.`
Find the value of work function (eV) of metal.

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