Sir this was the question i was saying that day....

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

1 Answers

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Anurag Ghosh ·

Ans. is 1/2 which should have been 3/4....

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