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When you shine a certain source of EM radiation on a sheet
of gold (work function W1 = 5.1 eV), the stopping voltage
required to bring all the ejected electrons to a halt is V =
3.5 V. If you were to use this same source of EM radiation
on a sheet of potassium (work function W2 = 2.3 eV), what
would be the maximum speed of ejected electrons?

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