Ytterbium has a work function of 2.6 eV.What is

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Ytterbium has a work function of 2.6 eV.

What is the longest wavelength of light that will release an electron from a ytterbium surface?

λmax = 480 nm

A 3.1 eV photon strikes the surface of ytterbium and an electron is emitted. What is the maximum possible speed of the electron?
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