Q5 · 2022 · Paper 2Simple familiar3 marks
QUESTION 5 (3 marks)
The Feynman diagram for a particle interaction is shown.
Describe the particle interaction taking place.
WORKED SOLUTION
3 marksQCAA guide · typeset solution
ANSWER
See worked solution below.
Worked solution
The Feynman diagram represents the interaction between an
electron and a positron through Bhaba scattering. During this
interaction, a photon is exchanged between the electron and
positron, before both particles change velocity as they move
away from each other.
• identifies that the interaction involves an electron
and a positron [1 mark]
• identifies that a photon is exchanged [1 mark]
• describes that both particles change velocity due
to the interaction [1 mark]
One QCAA sample method typeset for web; criterion wording is adapted from the official marking guide.
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