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Exchange particles and Feynman diagrams

Exchange particles and Feynman diagrams

Feynman diagram of two electrons repelling by exchanging a photon, with a time axis pointing upward

A Feynman diagram shows particles as lines and interactions as vertices where exchange particles are emitted or absorbed. In electromagnetic repulsion, two electrons exchange a virtual photon γ\gammaγ and both stay as electrons because the photon has no charge.

Particle interactions Lesson

  1. A Level
  2. /Physics
  3. /Particle interactions

Step-by-step lessons on AQA A Level Physics Particle interactions. Each one builds up to exam-style questions. Physics is one of the most mathematically demanding A Levels -- at least 40% of the marks require maths skills at Level 2 (GCSE) standard or above, so build calculation and graph-handling fluency alongside the conceptual content from the start.

Lessons