Probability of nucleus..

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Radium(Atomic no. 87 and mass no.221) is a radioactive substance having half life of 4 days.Find the probability that a nucleus undergoes decay after two half lives.
A.1
B.1/2
C.3/4
D.1/4

#Physics #Modern physics

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Shaswata Roy ·2014-01-03 07:44:19

After 2 half lives the amount decayed would be =
\left(1-\frac{1}{2^2}\right)N_0=\frac{3}{4}N_0

Hence the probability that a nucleus had decayed in this time interval= Amount decayedInitial amount=34

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Anurag Ghosh ·2014-01-03 18:22:56

But the ans is 1/2..

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Probability of nucleus..

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