(Solved): A rock contains 0.538 mg ^(206)Pb for every 1.000 mg ^(238)U present. Assuming that no lead was orig ...

A rock contains 0.538 mg

for every 1.000 mg

present. Assuming that no lead was originally present, that all the

formed over the years has remained in the rock, and that the number of nuclides in intermediate stages of decay between

and

is negligible, calculate the age of the rock. (The atomic mass of

is 205.97 u and the atomic mass of

is 238.05 . For

,

years.) Age

years