1.

Half lives of two isotopes X and Y of a material are known to be 2xx10^(9) years and 4xx10^(9)years respectively. If a planet forms with equal number of these isotopes, estimate the current age of the planet, given that currently the material has 20% of X and 80% of Y by number

Answer»

`2XX10^(9)` YEARS
`4xx10^(9)` years
`6xx10^(9)` years
`8XX10^(9)` years

Answer :D


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