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Giancoli 7th Edition textbook cover
Giancoli's Physics: Principles with Applications, 7th Edition
30
Nuclear Physics and Radioactivity
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30-1: Nuclear Properties
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30-2: Binding Energy
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30-3 to 30-7: Radioactive Decay
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30-8 to 30-11: Half-Life, Decay Rates, Decay Series, Dating
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Question by Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014, Reprinted by permission of Pearson Education Inc., New York.
Problem 53
Q

Rubidium-strontium dating. The rubidium isotope 3787Rb{^{87}_{37}\textrm{Rb}}, a β\beta emitter with a half-life of 4.75×1010 yr4.75 \times 10^{10} \textrm{ yr}, is used to determine the age of rocks and fossils. Rocks containing fossils of ancient animals contain a ratio of 3887Sr{^{87}_{38}\textrm{Sr}} to 3787Rb{^{87}_{37}\textrm{Rb}} of 0.0260. Assuming that there was no 3887Sr{^{87}_{38}\textrm{Sr}} present when the rocks were formed, estimate the age of these fossils.

A
1.78×109 Bq1.78 \times 10^9 \textrm{ Bq}
Giancoli 7th Edition, Chapter 30, Problem 53 solution video poster
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