Baryons and Leptons Conservation Principles

This video introduces the classification of subatomic particles into hadrons and leptons. Hadrons, which include baryons and mesons, are made of quarks and interact via all fundamental forces. Baryons have an odd number of quarks, while mesons consist of a quark and an antiquark. Leptons, on the other hand, are fundamental particles that interact through weak, gravitational, and electromagnetic forces but not the strong force. The video also emphasizes the conservation of baryon and lepton numbers in interactions. Finally, viewers are encouraged to engage with Cowan Physics for more learning.

What are hadrons primarily composed of?

• Photons

• Quarks

• Electrons

• Neutrinos

Which of the following is a characteristic of baryons?

• They are not affected by the strong nuclear force

• They are made of one quark and one anti-quark

• They have an even number of quarks

• They have an odd number of quarks

Which particles are examples of mesons?

• Protons and neutrons

• Muons and tau particles

• Electrons and positrons

• Pions and kaons

What must be conserved in any interaction involving baryons?

• Lepton number

• Baryon number

• Mass

• Charge

What forces do leptons interact with?

• Strong nuclear force

• All fundamental forces

• Weak, gravitational, and electromagnetic forces

• Only gravitational force

How many generations of leptons are there?

• One

• Four

• Two

• Three

Which lepton is found in the first generation?

• Muon

• Tau

• Electron

• Neutrino

What happens to muons and tau particles over time?

• They become neutrinos

• They remain stable

• They transform into protons

• They decay into electrons

What is the lepton number of a muon?

• Three

• Two

• One

• Zero

Which of the following is true about lepton number conservation?

• It applies only to the first generation of leptons

• It must be conserved separately for each generation

• It is not a fundamental conservation law

• It applies only to charged leptons