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  • Which element has a line of wavelength <img alt="\mathrm{1.785 \AA}" src="https://ent

Which element has a \mathrm{K_\alpha} line of wavelength \mathrm{1.785 \AA} ?
 

Option: 1

Copper


 


Option: 2

Cobalt
 


Option: 3

Sodium
 


Option: 4

Aluminium


Answers (1)

best_answer

We know that, \mathrm{\frac{1}{\lambda_{\mathrm{k}_\alpha}}=\mathrm{R}(\mathrm{Z}-1)^2\left(\frac{1}{1^2}-\frac{1}{2^2}\right)}

\mathrm{ (Z-1)^2=\frac{4}{3} \times \frac{1}{\lambda_{\mathrm{k}_\alpha} \mathrm{R}}=680 }

\mathrm{ (Z-1)=26 }

\mathrm{ Z=27 \rightarrow \text { cobalt } }

Hence option 2 is correct.




 

Posted by

Irshad Anwar

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