40K decays to 40Ar with a half-life of 1.3 billion years. Argon is a gas, so 40Ar escapes into the atmosphere once it forms. Suppose a sample of granite originally contained 20 g of 40K, but it now contains only 5 g. How many half-lives have passed? How old is the rock?

40K decays to 40Ar with a half-life of 1.3 billion years. Argon is a gas, so 40Ar escapes into the atmosphere once it forms. Suppose a sample of granite originally contained 20 g of 40K, but it now contains only 5 g. How many half-lives have passed? How old is the rock?

The Solar System

9th Edition

ISBN:9781305804562

Author:Seeds

Publisher:Seeds

Chapter16: Meteorites, Asteroids, And Comets

Section: Chapter Questions

Problem 4DQ

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Half Life

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⁴⁰K decays to ⁴⁰Ar with a half-life of 1.3 billion years. Argon is a gas, so ⁴⁰Ar escapes into the atmosphere once it forms. Suppose a sample of granite originally contained 20 g of ⁴⁰K, but it now contains only 5 g. How many half-lives have passed? How old is the rock?

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