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
40 years
80 years
100 years
60 years
A
40 years
B
80 years
C
60 years
D
100 years
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Solution
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NN0=18=123
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