Question: The ionization potentials for electrons in the n=1, 2, and 3 energy levels of Pb are 1,400e-17 J, 240e-17 J, and 48e-17 J, respectively. When

The ionization potentials for electrons in the n=1, 2, and 3 energy levels of Pb are 1,400e-17 J, 240e-17 J, and 48e-17 J, respectively. When an electron in the n=2 level fills a vacancy in the n=1 level, what is the energy of the X-ray that is emitted?

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