Physics · 2013
NEET 2013 · 5 May · Code W · Q35
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…
The half life of a radioactive isotope 'X' is $\displaystyle 20$ years. It decays to another element 'Y' which is stable. The two elements 'X' and 'Y' were found to be in the ratio $\displaystyle 1: 7$ in a sample of a given rock. The age of the rock is estimated to be :
Official answer
(2)
$\displaystyle 60$ years
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NEET (UG) 2013 Physics question, with the answer from NTA’s final answer key. Where our answers come from.