Question: E . 1 0 An unknown element is used as a target in an x - ray tube. Measurements show that the characteristic spectral lines

E.10 An unknown element is used as a target in an x-ray tube. Measurements show that the characteristic spectral lines with the longest wavelengths are 0.155 nm and 0.131 nm. What is the element? (Hint: you will find the answer to Problem E.9a to be useful.)

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