You have a rock sample and analyze it for the presence of


You have a rock sample and analyze it for the presence of radioactive isotopes in order to determine when it was formed. You find an isotope that has a half-life of 100 million years. After you analyze it, you determine that it has equal amounts of radioactive parent isotope and stable daughter product.

A: How many half lives have gone by?

B: How old is it?

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