The decay constant is given by the formula:
\[ \lambda = \frac{A}{N} \]
where \( A \) is the activity and \( N \) is the total number of atoms. Substituting the given values, we get:
\[ \lambda = \frac{6.00 \times 10^{11} \, \text{Bq}}{1.00 \times 10^{15} \,
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