48. (a) From Fig. 41-14 we estimate the wavelengths corresponding to the K α and K β lines to be λ α = 70 . 0pm and λ β =63 . 0 pm, respectively. Using the result of problem 3 in Chapter 39, adapted to these units ( hc = 1240 eV · nm = 1240 keV · pm), E α = hc λ α = 1240 keV · pm 70 . 0pm =17 . 7keV
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