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Questions and Answers
What is the force that holds nucleons together?
Which of the following particles is a Fermion?
Which of the following particles is a Meson?
What is the property that is conserved in all particle interactions involving Leptons?
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What is the name of the messenger particle responsible for the Electromagnetic Force?
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Which of the following reactions is an example of a strong interaction?
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What is the property that is conserved in interactions involving the Strong Force?
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Which of the following particles has an antiparticle with the same mass and spin but opposite electric charge?
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What is the name of the messenger particle responsible for the Gravitational Force?
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Which of the following particles is an example of a Baryon?
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Study Notes
Fermions and Bosons
- Particles with half-integer quantum numbers are fermions, examples include electrons.
- Particles with integer quantum numbers are bosons.
- Fermions obey the Pauli Exclusion Principle.
- Bosons do not obey the Pauli Exclusion Principle.
Hadrons and Leptons
- Particles held together by the strong force are hadrons.
- Particles affected by the weak force are leptons.
- Hadrons include protons, neutrons, and pions.
- Leptons include electrons and neutrinos.
Classification of Hadrons
- Some hadrons are bosons, known as mesons, examples include pions.
- Other hadrons are fermions, known as baryons, examples include protons.
Antiparticles
- Every particle has a corresponding antiparticle with the same mass and spin but opposite electric charge.
Particle Interactions
- Proton-antiproton reaction is a strong interaction, resulting in 4π⁺ + 4π⁻, and charge is conserved.
- Pion decay is a weak interaction, resulting in μ⁺ + ν, and charge is conserved.
- Muon decay is a weak interaction, resulting in e⁺ + v + v̅, and charge is conserved.
Conservation Laws
- Lepton number is always conserved in all particle interactions.
- Strangeness is conserved in interactions involving the strong force.
Messenger Particles
- Weak forces are mediated by W and Z messenger particles.
- Strong forces are mediated by gluons.
- Electromagnetic force is mediated by photons.
- Gravitational force is mediated by gravitons.
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Description
Identify and understand the characteristics of fermions and bosons, and hadrons and leptons in physics, including their spin, quantum numbers, and forces.
