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  • what element has  line of wavelength 1.785 A? <img alt="R=1099737 \: cm^{-1}" src="/latex-image/?R%3D1099737%20%5C%3A%20cm%5E%7

what element has k_{\alpha } line of wavelength 1.785 A? R=1099737 \: cm^{-1}

Option: 1

Platinum 


Option: 2

Zinc 


Option: 3

Iron


Option: 4

Cobal


Answers (1)

best_answer

\begin{aligned} & (Z-1)^2=\frac{4}{3} \frac{1}{\lambda_{k_\alpha}} \frac{1}{R}=\frac{4}{3} \times \frac{1}{1.785 \times 10^{-8}} \times \frac{1}{109737} \\ & \Rightarrow(Z-1)^2=680.6 \Rightarrow Z-1=26 \Rightarrow Z=27 \end{aligned}

Thus, the element is cobalt.

Posted by

Gautam harsolia

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