A Pure Sample of ²²⁶Ra Contains 3

question 21

Multiple Choice

A pure sample of ²²⁶Ra contains 3.0 × 10¹⁴ atoms of the isotope.If the half-life of ²²⁶Ra = 1.6 × 10³ years,what is the activity of this sample?

• A) 13 × 10¹⁰ decays/yr
• B) 9.4 × 10¹⁰ decays/yr
• C) 6.7 × 10⁹ decays/yr
• D) 8.7 × 10¹⁰decays/yr

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