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The Kα x rays arising from a cobalt (Z = 27) target have a wavelength of about 179 pm. The atomic number of a target that gives rise to Kα x rays with a wavelength one-third as great (≈ 60 pm) is:

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The Kα x rays arising from a cobalt (Z = 27) target have a wavelength of about 179 pm. The atomic number of a target that gives rise to Kα x rays with a wavelength one-third as great (≈ 60 pm) is:






 
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