Radioactive Decay: The decay constant of a radioactive isotope is 1.60 × 10-3 s-1. At a given instant, the number of atoms of the radioactive isotope is 1.85 × 1012. How many atoms of the isotope remain after a time interval of 30.0 minutes?
A. 1.04 × 1011
B. 1.14 × 1011
C. 1.26 × 1011
D. 1.38 × 1011
E. 1.52 × 1011
Answer: A
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