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Using radiation of wavelength 3500 Å, it is observed that the maximum kinetic energy of the emitted photoelectrons is 1.6 eV for potassium. Calculate the work function of the metal. [h=6.626 x 10-34 Js, 1 eV=1.6 x 10-19 J]

(A) 3 eV

(B) 2.5 eV

(C) 3.5 eV

(D) 2 eV