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If ${\lambda _{{K_\alpha }}},{\lambda _{{K_\beta }}}\$ and ${\lambda _{{L_\alpha }}}\$ are the wavelengths of ${K_\alpha },{K_\beta }\$ and ${L_\alpha }\$ lines, then

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If and are the wavelengths of and lines, then

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If ${\lambda _{{K_\alpha }}},{\lambda _{{K_\beta }}}\$ and ${\lambda _{{L_\alpha }}}\$ are the wavelengths of ${K_\alpha },{K_\beta }\$ and ${L_\alpha }\$ lines, then