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If the longest wavelength of an incident photon capable of ejecting an electron from a metal surface is 560 nm, what must be the work function of the metal surface?

$$\left(1\text{ eV}=1.609\times {10}^{-19}\text{ J}, h=6.626\times {10}^{-34}\text{ J s}, c=3.00\times{10}^{8}\text{ m/s}\right)$$

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