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5. a. What element has a x-ray line of wavelength 0.144 nm? b. Find the energy and the wavelength of the x-ray of aluminum. c. The effective charge experienced by an M ( = 3) electron in an atom of atomic number Z is about ( − 7.4)e. Show that the frequency of the x-ray of such an element is given by 3(−7.4)236 .

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