Question

Torgeir is on a geology field trip and finds a meteorite that contains 8 times more argon-40 than potassium-40. The half-life of potassium-40 is 1.25 × 109 years. Assume the only decay product is argon-40. How old is the rock in billions of years (109 years)?

Answer 1

Ratio of the Argon -40 to potassium -40 = 8

The half-life of potassium-40 is 1.25 × 109