Find the probability that the nucleus of 87Ra221 undergoes decay afte – McqOptions

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1.	Find the probability that the nucleus of 87Ra221 undergoes decay after three half-lives, if its a radioactive substance which has a half-life of 6 days.
A.	\(\frac {1}{6}\)
B.	\(\frac {3}{2}\)
C.	\(\frac {5}{6}\)
D.	\(\frac {1}{2}\)
Answer» D. \(\frac {1}{2}\)

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