Worksheet: The Conservation of Baryon Number

In this worksheet, we will practice determining the baryon number of composite particles and sets of particles and whether given interactions conserve baryon number.

Q1:

What is the baryon number of a charm antiquark?

  • A13
  • B0
  • C1
  • D+1
  • E+13

Q2:

What is the baryon number of a proton?

Q3:

A tetraquark is a hypothetical particle that is made up of four quarks. If a tetraquark had the composition 𝑐̄𝑐𝑑̄𝑢, what would its baryon number be?

Q4:

Which of the following particles have a baryon number of 1?

  • down quark
  • down antiquark
  • antielectron
  • tauon
  • tau neutrino
  • tau antineutrino
  • antiproton
  • neutron
  • photon
  • ATau neutrino and down quark
  • BAntielectron and neutron
  • CTauon and down antiquark
  • DAntiproton
  • EPhoton, neutron, and tau antineutrino

Q5:

Which of the following particles have a baryon number of 1?

  • electron
  • neutron
  • top quark
  • D meson
  • delta baryon
  • electron neutrino
  • proton
  • B meson
  • charm quark
  • ANeutron, top quark, and D meson
  • BProton, neutron, and delta baryon
  • CProton, B meson, and charm quark
  • DTop quark, B meson and D meson
  • EElectron neutrino and charm quark

Q6:

What is the baryon number of an electron neutrino?

Q7:

What is the baryon number of a top quark?

  • A+23
  • B+13
  • C13
  • D0
  • E23

Q8:

Which of the following particle interactions does not conserve baryon number?

  1. Σ𝜋++0p+
  2. Σ𝜆𝛾00+
  3. p+p++++0𝜋𝜋𝜋
  4. p+++00𝜋Κ𝜆
  5. 𝜋𝜇𝜈+
  6. Δ𝜋00n+
  • Avi
  • Bv
  • Ci
  • Dii and iv
  • Eiii and v

Q9:

A 𝜋 is a meson that is made up of an up quark and a down antiquark. What is the baryon number of a 𝜋?

Q10:

Which of the following particles have a baryon number of +13?

  • pion
  • down quark
  • photon
  • up antiquark
  • proton
  • neutron
  • strange antiquark
  • bottom quark
  • electron
  • AStrange antiquark and electron
  • BDown quark and bottom quark
  • CPion and photon
  • DUp antiquark and proton
  • EElectron and neutron

Q11:

Which of the following particles have a baryon number of 0?

  • proton
  • top quark
  • electron
  • B meson
  • down antiquark
  • tauon
  • mu neutrino
  • delta baryon
  • up quark
  • AB meson, electron, mu neutrino, and tauon
  • BTop quark, electron, mu neutrino, and tauon
  • CDown antiquark, delta baryon, and up quark
  • DUp quark, delta baryon, and B meson
  • ETauon, mu neutrino, and top quark

Q12:

What is the baryon number of a muon?

Q13:

Which of the following particles have a baryon number of 13?

  • tauon
  • down antiquark
  • kaon
  • strange quark
  • up antiquark
  • muon
  • photon
  • tau neutrino
  • top antiquark
  • ADown antiquark, up antiquark, and top antiquark
  • BTau neutrino, photon, and kaon
  • CKaon, photon, and up antiquark
  • DMuon, tauon, and strange quark
  • EStrange quark and top antiquark

Q14:

A Xi baryon is a particle that is made up of one up quark and two strange quarks. What is the baryon number of a Xi baryon?

Q15:

The following equation shows a proton and an antiproton annihilating to produce a gamma-ray photon: p+p̄𝛾

What is the total baryon number before this interaction takes place?

What is the total baryon number after this interaction takes place?

Q16:

The following equation shows a sigma baryon decaying into a lambda baryon and a pion: ΣΛ𝜋0++

What is the total baryon number before this interaction takes place?

What is the total baryon number after this interaction takes place?

Q17:

The following equation shows a particle interaction that would not conserve baryon number: 𝛾𝜋p++

What is the total baryon number before this interaction takes place?

What is the total baryon number after this interaction takes place?

Q18:

The equation Λ𝜋p++ shows a lambda baryon decaying into a proton and a pion.

What is the total baryon number before this interaction takes place?

What is the total baryon number after this interaction takes place?

Q19:

The following equation shows a particle interaction that would not conserve baryon number: Λ𝜋𝜋0++

What is the total baryon number before this interaction takes place?

What is the total baryon number after this interaction takes place?

Nagwa uses cookies to ensure you get the best experience on our website. Learn more about our Privacy Policy.