Physics Level 12
Chapter 22 Subatomic Physics
Interactions of subatomic particles result in the formation of atoms and other particles. Four fundamental forces are involved in these interactions: strong force, weak force, electromagnetic force, and gravitational force. Nuclear fission is an important energy source today, and nuclear fusion may be an important energy source in the future. In addition, radioactive decay makes it possible to date organic materials that are 1000 to 25,000 years old.
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