The following graph does not represent a decay curve. Explain.

• A. Based on the graph, the half-life of the sample is six hours, but the second half-life is approximately 15.0 hours. The second half-life should be 12.0 hours.
• B. After six half-lives, a decay curve should be approaching zero. The graph indicates that out of the 100 g sample, 17.0 g (17.0%) remain after six half-lives.
• C. Both A and B
• D. None of the above

Answer: (C)