Worksheet: Feynman Diagrams

In this worksheet, we will practice interpreting Feynman diagrams and determining which interactions are possible using Feynman diagrams.

Q1:

Which of the following Feynman diagrams shows a muon decaying into an electron and two neutrinos via the weak interaction?

  • A
  • B
  • C
  • D

Q2:

Is the interaction shown in the Feynman diagram possible? If not, why not?

  • ANo, because it doesn’t conserve baryon number
  • BNo, because it doesn’t conserve electric charge
  • CNo, because it doesn’t conserve lepton number
  • DNo, because it doesn’t conserve energy
  • EYes

Q3:

The Feynman diagram shows a neutron undergoing beta decay. What particle is represented by 𝑋 in the diagram?

  • A 𝑊
  • B 𝛽
  • C 𝛾
  • D 𝑒
  • E 𝑊

Q4:

The Feynman diagram is supposed to show the annihilation of an electron and a positron to produce a gamma-ray photon and then the pair production of an electron and a positron by that same photon. However, the diagram has been drawn incorrectly. Which of the following statements correctly describes how the diagram is incorrect? Time goes from left to right in the diagram.

  • AThere is no arrow on the line for a photon.
  • BThe photon should be represented by a straight, dashed line rather than a sinusoidal line.
  • CThe arrows for the electron lines have been drawn in the wrong direction. The lines for particles with negative electric charge should point backward in time.
  • DThe arrows for the positron lines have been drawn in the wrong direction. Antiparticle lines should point backward in time.
  • EThe photon line should be drawn at an angle to show its movement through space.

Q5:

The Feynman diagram shows an up quark in a proton that collides at high speed with another proton. The up quark emits a gluon, which then produces a down quark–antiquark pair. How many virtual particles are shown in the diagram?

Q6:

Which of the following Feynman diagrams shows the interaction 𝛾 e + e + ?

  • A
  • B
  • C
  • D

Q7:

Which of the following Feynman diagrams shows the annihilation of an electron and a positron to produce a gamma-ray photon?

  • A
  • B
  • C
  • D

Q8:

What phenomenon does the Feynman diagram show? The 𝑥 -axis represents time.

  • AElectromagnetic attraction between an up quark and an electron
  • BElectron–positron pair production
  • C 𝛽 decay
  • DElectron–positron annihilation
  • E 𝛽 decay

Q9:

What particle phenomenon does the Feynman diagram show? The 𝑥 -axis represents time.

  • AAbsorption of a photon by an electron
  • BEmission of a photon by an electron
  • CElectromagnetic repulsion between two electrons
  • DElectron–positron pair production
  • EElectron–positron annihilation

Q10:

What particle phenomenon does the Feynman diagram show? The 𝑥 -axis represents time.

  • AAbsorption of a photon by an electron
  • BElectron–positron pair production
  • CElectromagnetic attraction between an electron and a positron
  • DElectron–positron annihilation
  • EEmission of a photon by an electron

Q11:

What particle phenomenon does the Feynman diagram show? The 𝑥 -axis represents time.

  • AEmission of a photon by an electron
  • BElectromagnetic attraction between an electron and a positron
  • CAbsorption of a photon by an electron
  • DElectron–positron annihilation
  • EElectron–positron pair production

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