A Pure Sample of ²²⁶Ra Contains 3

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