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A rock originally had 1500 atoms of U-235 and it now has 750 how old is it?
Wiki User
∙ 14y ago
For a rock to have started with 1500 atoms of any element and now have 750 it has undergone radioactive decay equal to one full half life (i.e. there are half the number of atoms now than at the beginning).
Uranium-235 has a half life of 7.038×108 years.
As such, the rock is 7.038×108 or 703 million years old.
Wiki User
∙ 14y ago
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