IMG_0460.jpeg

# Decay of Carbon-14 The graph displays the decay of Carbon-14, showing the percentage of Carbon-14 atoms remaining over time. The x-axis represents the age of the sample in years, and the y-axis represents the percentage of Carbon-14 atoms remaining. A smooth curve illustrates the exponential dec...

# Decay of Carbon-14 The graph displays the decay of Carbon-14, showing the percentage of Carbon-14 atoms remaining over time. The x-axis represents the age of the sample in years, and the y-axis represents the percentage of Carbon-14 atoms remaining. A smooth curve illustrates the exponential decay. **Question:** Pretend you find a rock with 3.125% parent atoms (Carbon-14) and 96.875% daughter atoms. How many half-lives have passed? **Possible Answers:** * a) 1 * b) 2 * c) 3 * d) 4 * e) 5 **Analysis:** Based on the graph, a sample with 3.125% Carbon-14 remaining corresponds to an approximate age of 25,000 to 30,000 years. Looking at the graph, this corresponds to approximately 3 half-lives. **Answer:** The correct answer is **c) 3**.