A Pure Sample of ²²⁶Ra Contains 2

question 53

Multiple Choice

A pure sample of ²²⁶Ra contains 2.0 x 10¹⁴ atoms of the isotope.If the half-life of ²²⁶Ra = 1.6 x 10³ years,what is the activity of this sample?

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

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