1. Define the following terms:
   1. Radioactive half-life
   2. Correspondence principle
   3. Schrdinger wave equation
   4. de Broglie matter waves
2. Explain how "carbon dating" is used to establish the age of once living things.
3. State the number of neutrons and protons in each of the following nuclei:
   1. ¹₁ H
   2. ¹⁷⁹₇₉ AU
   3. ¹⁴₆ C
   4. ²³⁹₉₂ U
4. When radium 226 decays emitting an alpha particle, what is the atomic number and atomic mass of the resulting nuclei?
5. If a sample of a radioactive isotope has a half-life of 3 years, how much of the original sample will be left at the end of:
   1. 3 years?
   2. 6 years?
   3. 9 years?
   4. 15 years?
6. Define the following terms:
   1. Quarks
   2. Nucleon
   3. Strong Force
7. Explain why nuclei that contain more than 82 protons are radioactive.
8. What is a radioactive tracer?