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0 votes
58.6k views
in Physics by (36.3k points)

The activity of a radioactive sample falls from 700 s–1 to 500 s–1 in 30 minutes. Its half life is close to :

(1) 66 min

(2) 52 min

(3) 72 min

(4) 62 min

2 Answers

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Answer is (4) 62 min

+1 vote
by (51.9k points)

Answer is (4) 62 min

(2.06004) 30 = t1/2 = 61.8 min

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