The equation for work function is: W= hf
So, this is rearranged to: f = W/h where h is planck's constant.
Therefore, if we know the work function then we can work out thethreshold frequency.
Don't forget to convert 3eV into J. 1eV = 1.6 x 10^{-19} J.
f = (3 x 1.6 x 10^{-19})/(6.63 x 10^{-34})
f = 7.24 x 10^{14} Hz
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