Rankers Physics
Topic: Modern Physics
Subtopic: Nucleus

A radio isotope 'X' with a half life \[1.4\times 10^{9} years\] decays to 'Y' which is stable. A sample of the rock from a cave was found to contain 'X' and 'Y' in the ratio 1 : 7. The age of the rock is :
\[1.96\times 10^{9} years\]
\[3.92\times 10^{9} years\]
\[4.20\times 10^{9} years\]
\[8.40\times 10^{9} years\]

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