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Solution: Magnesium metal is used in a photoelectric effect experiment...

Question

Magnesium metal is used in a photoelectric effect experiment.  The work function for Mg (i.e. the energy required to remove an electron) is 3.68 eV.  What is the longest wavelength of light, in nm, that can remove an electron from the Mg.  

(1 eV = 1.602 x 10 -19 J; h = 6.63 x 10 -34 J•sec; c = 3.00x10 8 m/sec).