Schaum's Outline of College Physics, Twelfth Edition (Schaum's Outlines)
Schaum's Outline of College Physics, Twelfth Edition (Schaum's Outlines)
12th Edition
ISBN: 9781259587399
Author: Eugene Hecht
Publisher: McGraw-Hill Education
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Chapter 46, Problem 29SP

Rubidium-87 has a half-life of 4.9 × 10 10 years and decays to strontium-87, which is stable. In an ancient rock, the ratio of 87 Sr to  87 Rb is 0.005 0. If we assume all the strontium came from rubidium decay, about how old is the rock? Repeat if the ratio is 0.210.

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