APFIVE Radioactive Decay Calculation Method
A sample of radioactive material decays such that 30% of the original nuclei remain after 10 hours. A researcher needs to determine when the sample will have only 5% of its original nuclei. What is the correct approach?
A
Divide 10 hours by 6 since 30%/5% = 6
B
Calculate λ from the first measurement, then find t for 5%
C
Multiply the original time by the ratio 30%/5%
D
Use the half-life formula with 30% to find t for 5%
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