A sample contains 2.0 × 10²⁰ radioactive nuclei with decay constant 1.5 × 10⁻¹⁰ s⁻¹. What is its activity?
Correct answer C. 3.0 × 10¹⁰ Bq
Explanation
Activity is the decay constant times the number of undecayed nuclei: A = λN = 1.5 × 10⁻¹⁰ × 2.0 × 10²⁰ = 3.0 × 10¹⁰ Bq.
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