A Pure Sample of ²²⁶Ra Contains 3

question 41

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

• A) 2.7 *10^-12 Ci
• B) 11 *10^-8 Ci
• C) 3.4 *10^-10 Ci
• D) 7.4 *10^-8 Ci

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