Radioactive Decay Calculation Method
A radioactive sample decays, leaving 30% of the initial nuclei after 10 hours. What is the correct procedure to determine the time at which only 5% of the initial nuclei will remain?
A
Use the half-life formula with 30% to find t for 5%
B
Calculate λ from the first measurement, then find t for 5%
C
Multiply the original time by the ratio 30%/5%
D
Divide 10 hours by 6 since 30%/5% = 6
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