1.

A sample of rock from moon contains equal number of atoms of uranium and lead (t_((1)/(2)) for U= 4.5 xx 10^(9) years). The age of the rock would be

Answer»

`4.5 XX 10^(9)` YEARS
`9 xx 10^(9)` years
`13.5 xx 10^(9)` years
`2.25 xx 10^(9)` years

Answer :A


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