Summary

• Structure of the nucleus
• Radioactive decay

• Binding energy of the nucleus
  • origin of the energy
  • maximum energy
  • stars & nuclear fusion
    Example #1
  
  
• Exponential decay
  • random processes applet
  • half-life applet
  • radioactive clocks
  • activity
    Example #2
    Example #3
  
  
• NY Times survey

gc6 30.12
Use Appendix B to calculate the binding energy per nucleon for nitrogen-14.
A. 7.48 MeV                B. 0.112 MeV
C. 15.0 MeV                D. 105 MeV
Answer







kw5
If you start with 2 kg of a radioactive substance, how much will you have after 4 half-lives?
A. 125 g                B. 500 g
C. 2 kg                  D. 8 kg
Answer







gc6 30.38
What is the activity of a sample of carbon-14 that contains 3.1×10²⁰ nuclei? The half-life is 5730 y.
A. 5.6×10³¹ s^-1                B. 3.1×10²⁰ s^-1
C. 3.8×10¹⁶ s^-1                D. 1.2×10⁹ s^-1
Answer







 



A. 7.48 MeV













 



A. 125 g













 



D. 1.2×10⁹ s^-1