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A radioactive isotope X with a half-life...

A radioactive isotope `X` with a half-life of `1.37 xx 109` years decays to `Y` which is stable. A sample of rock from the moon was found to contain both the elements `X` and `Y` which were in the ratio of `1 : 7`. The age of the rock is.

A

`1.96xx10^8` yr

B

`3.85xx10^9` yr

C

`4.11xx10^9` yr

D

`9.59xx10^9` yr

Text Solution

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The correct Answer is:
C
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