A Pure Sample of ²²⁶Ra Contains 2

question 54

Multiple Choice

A pure sample of ²²⁶Ra contains 2.3 × 10¹³ atoms of the isotope.If the half-life of ²²⁶Ra = 1.6 × 10³ years,what is the activity of this sample?

• A)1.4E+10 decays/yr
• B)1.0E+10 decays/yr
• C)3.2E+2 decays/yr
• D)3.7E+16 decays/yr
• E)​6.2E+6 decays/yr

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