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
30-2: Binding Energy
30-3 to 30-7: Radioactive Decay
30-8 to 30-11: Half-Life, Decay Rates, Decay Series, Dating

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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