The ratio (by weight) for `U^(238)` in a rock sample is 4:3. Assume that originally the rock had only `U^(238)` and the entire `Pb^(226)` is product of decay of `U^(238)`. The intermediate radioactive nuclides in the chain are very small in quantity in the rock.
Find the age of the rock if half life of `U^(238)` is `4.5xx10^(9)` year.
`["log"_(10)1.79=0.25,"log"_(10)2=0.3]`

Answer

`3.75xx10^(9)y`