Which Element Produces Lower Energy Ka X-rays in an Experiment?

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In an experiment one observes the characteristic Ka X-rays of two elements at energies of 6.930 and 7.478 eV. The higher energy line is due to Ni. What element is responsible for the lower energy line?
 
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Is this homework? Edit: I moved it to the homework section.

Simply typing the energy into google gave a result within 10 seconds, faster than typing the question here.
 
Last edited:
mfb said:
Is this homework?

Simply typing the energy into google gave a result within 10 seconds, faster than typing the question here.
I have to use formula to find it
 
Then you should look up that formula and use it.
 

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