A Pure Sample of ²²⁶Ra Contains 2

question 18

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 decay rate of this sample? (1 Ci = 3.7 x 10¹⁰ decays/s)

• A)2.7 x 10^-12 Ci
• B)3.4 x 10^-10 Ci
• C)7.4 x 10^-8 Ci
• D)9.6 x 10^-6 Ci

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