The half-life of a radioactive isotope $X$ is $50$ yr. It decays to nother element $Y$ which is stable. The two elements $X$ and $Y$ were found to be in the ratio of $1 : 15$ in a sample of a give rock. The age of the rockwas estimated to be

200 y r

250 y r

100 y r

150 y r

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The half-life of a radioactive isotope

X

50

yr. It decays to nother element

Y

which is stable. The two elements

X

and

Y

were found to be in the ratio of

1 : 15

in a sample of a give rock. The age of the rockwas estimated to be

8 mins ago

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