A sample of rock from moon contains equal number of atoms of uranium and lead `(t""_(1//2)for U=4.5xx10""^(9)`year). The age of the rock would be a)`4.5xx10""^(9)` year b)`9xx10""^(9)` year c)`13.5xx10""^(9)` year d)`2.25xx10""^(9)` year

Options

A. `4.5 xx 10^(9)` years
B. `9 xx 10^(9)` years
C. `13.5 xx 10^(9)` years
D. `2.25 xx 10^(9)` years

Answer

A