A sample of rock from moon contains atom...

A sample of rock from moon contains atoms of uranium and lead in the ration 1:3. Then age of rock will be `(t_(1//2)"for uranium"=4xx10^(10)years)` :

`4xx10^(2)years`

`1.2xx10^(10)years`

`8xx10^(10)years`

`2xx10^(9)years`

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