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

A radioactive isotope X with a half-life of `1.37xx10^(9)` yr decays to Y which is satble. 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

`1.96 xx 10^(8)` year

B

`3.85 xx 10^(9) ` years

C

`4.11 xx 10^(9)`

D

`3.06 xx 10^(9)` years

Text Solution

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The correct Answer is:
C
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