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3. Light with energy of 3.1 ev is directed at a potassium surface, which has a work function of 2.3 eV. This causes electrons to

3. Light with energy of 3.1 ev is directed at a potassium surface, which has a work function of 2.3 eV. This causes electrons to be emitted. Calculate the maximum speed of the emitted electrons. [T4]

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