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TOK physics: Feynman diagrams

Knowledge questions If you understand a model do you understand the concept it is modelling? Is a model useful even if it bears little resemblance to the process the process it is modelling? Can models be a hindrance to the proper understanding of a concept? Feynman diagrams are use in particle physics, they are quite simple and governed by strict rules, here is an example. This is called a vertex, the way it is...

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