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JEEMAIN and NEET
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NEET PAST PAPERS
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2013
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Q)
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 -
( A ) 60 years
( B ) 40 years
( C ) 80 years
( D ) 100 years
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