alleryMean life of a radioactive sample is the time for its nuclei to fall to what?
AHalf the initial number
B1/4 of the initial number
CZero nuclei remaining
D1/e of the initial number
Answer & Solution
Correct answer: D. 1/e of the initial number
Mean life is when the number of undecayed nuclei has dropped to e^-1 of its starting value.
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