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Question

A tissue paper soaked with polluted water showed Kα peaks at 78.9 pm, 146 pm, 158 pm and 198 pm. Find the elements it contained.

Solution
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The frequency (f) of the Kα line is related to the atomic number Z by the following relation:
f=cλ=2.48×1015(Z1)2Z=1+cλ×2.48×1015=1+3×10878.9×1012×2.48×1015=40,i.e.,ZrZ=1+3×108146×2.48×103=30.1,i.e.,ZnZ=1+3×108158×2.48×103=29,i.e.,CuZ=1+3×108198×2.48×103=26,i.e.,Fe

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