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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 58
Q

47Be{^{7}_{4}\textrm{Be}} decays with a half-life of about 53 d. It is produced in the upper atmosphere, and filters down onto the Earth’s surface. If a plant leaf is detected to have 350 decay/s of 47Be{^{7}_{4}\textrm{Be}},

  1. how long do we have to wait for the decay rate to drop to 25 per second?
  2. Estimate the initial mass of 47Be{^{7}_{4}\textrm{Be}} on the leaf.
A
  1. 2.0×102 d2.0 \times 10^2 \textrm{ d}
  2. 2.7×10−14 g2.7 \times 10^{-14} \textrm{ g}
Giancoli 7th Edition, Chapter 30, Problem 58 solution video poster
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