Answer
$(\Delta K) / K=0.019 $
Work Step by Step
Now the mass of a lead atom is $207 \mathrm{u}$, so
$(\Delta K) / K=4(1.0 \mathrm{u})(207 \mathrm{u}) /(207 \mathrm{u}+1.0 \mathrm{u})^2\\=0.019 $
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