Electrons are emitted with zero velocity from a metal surface when it is exposed to radiation of wavelength 6800 Å. Calculate threshold frequency ( ? 0 ) and work function (W0 ) of the metal.

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c = νλ∴ νo = c/λo = 3.0×108 ms-1/6800×10-10 m = 4.14×1014 s-1Work function (wo) = hνo = 6.626×10-34 Js×4.14×1014 s-1 = 2.92×10-19 J