MHT CET Physics question
The half life of a radioactive isotope 'X' is 20 years. It decays to another element 'Y' which is stable. The two elements 'X' and 'Y' were found to be in the ratio 1:7 in a sample of a given rock. The age of the rock is estimated to be [NEET 2013]
Answer: (B)
Solution
, i.e. 3 half-lives years; 40, 80 and 100 years
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