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Question
If a radioactive isotope has a decay constant of 1.55 * 10-10 year-1, its half-life (in years) would be
Options:
A .  4.57 * 109
B .  4.47 * 109
C .  4.57 * 1010
D .  4.47 * 1010
Answer: Option B


-NA-


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