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A Pure Sample of ²²⁶Ra Contains 3

Question 9

Question 9

Multiple Choice

A pure sample of ²²⁶Ra contains 3.0 × 10¹⁵ atoms of the isotope.If the half-life of ²²⁶Ra = 1.6 × 10³ years,what is the activity of this sample?

A) 1.9E+12 decays/yr
B) 1.3E+12 decays/yr
C) 4.1E+4 decays/yr
D) 4.8E+18 decays/yr
E) 8.1E+8 decays/yr

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