(Solved):   Q4. A. Use the graph as shown below. Determine the half-life of Carbon-14. (Direct Mark ...

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Q4. A. Use the graph as shown below. Determine the half-life of Carbon-14. (Direct Marking, 5 marks) B. Evaluate using formula and solution, the remaining amount of Plutonium-239 after three half-lives, and Carbon-14 after four half-lives. (Rubrics, \( 2 \times 5=10 \) marks)