A rock contains 0.37 mg of Pb-206 and 0.95 mg of U-238.The half-life of the decay series U-238 $\rarr$ Pb-206 is 4.5 × 10⁹ yr.Assuming no Pb-206 was present in the rock initially, how old is the rock?

Question

Quizplus · Accepted Answer

The age of the rock can be calculated using the decay equation and the given half-life. The ratio of Pb-206 to U-238 is used to determine the number of half-lives that have passed, which is approximately 2.4 × 10^9 years.

A Rock Contains 0 →\rarr→ Pb-206 Is 4

A Rock Contains 0 $\rarr$ Pb-206 Is 4