Radioactive Decay: The decay constant of a radioactive nuclide is 3.1 × 10-3 s-1. At a given instant, the activity of a specimen of the nuclide is 70 kBq. How much later has the activity declined to 10 kBq?
A. 630 s
B. 690 s
C. 750 s
D. 820 s
E. 880 s
Answer: A
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