Ejection of the photoelectron from metal in the photoelectric effect experiment can be stopped by applying 0 . 5 V , when the radiation of 250 nm is used. The work function of the metal is

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λ = 250 nm = 2500 A E = hc λ = 12400 2500 = 4 .96 eV KE = e × stopping potential = 0 .5 eV E = W 0 + KE 4 .96 = W o + 0 .5 W 0 = 4 .46 ≈ 4 .5 eV

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