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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 46
Q

55124Cs{^{124}_{55}\textrm{Cs}} has a half-life of 30.8 s.

  1. If we have 8.7  μg8.7 \; \mu\textrm{g} initially, how many Cs nuclei are present?
  2. How many are present 2.6 min later?
  3. What is the activity at this time?
  4. After how much time will the activity drop to less than about 1 per second?
A
  1. 4.2×1016 nuclei4.2 \times 10^{16} \textrm{ nuclei}
  2. 1.3×1015 nuclei1.3 \times 10^{15} \textrm{ nuclei}
  3. 2.8×1013 Bq2.8 \times 10^{13} \textrm{ Bq}
  4. 26 min26 \textrm{ min}
Giancoli 7th Edition, Chapter 30, Problem 46 solution video poster
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