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If the threshold wavelength for a certain metal is 2000 , then the work-function of the metal is (a) 6.2 J (c) 6.2 MeV

If the threshold wavelength for a certain metal is 2000 , then the work-function of the metal is (a) 6.2 J (c) 6.2 MeV (b) 6.2 eV (d) 6.2 keV

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