Light of wavelength 291 nm shines on apiece of magnesium, Ask an Expert

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Light of wavelength 291 nm shines on apiece of magnesium metal. What is the speed of the ejected electron? (Light energy greater than that of the work function of magnesium ends up as kinetic energy of the ejected electron. The work function is the minimum energy needed to eject an electron from the metal by irradiating it with light. The photoelectric work function for magnesium is 5.90 x 10-19J.)

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