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The threshold energy may be given in the problem. For instance, in the example Dr. Lavelle used in lecture on Friday, "If 3.61x10^-19J is required to remove an electron with zero kinetic energy from a metal surface, what would be the longest wavelength of light to do this?". Here the note "with zero kinetic energy" tells us that the given value (3.61x10^-19 J) is the threshold energy. Since the question is asking for the longest wavelength this means the lowest energy light (no excess used/converted to kinetic energy), AKA when Ekinetic = 0.
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