So I was trying to understand quantum entanglement and the example that was used to describe an entangled pair of particles was of an electron and positron after it is formed from a photon in pair production . So I was wondering why is it assumed that the particles produced from a photon in pair production have opposite spin?
If anyone is looking for the video that I saw https://www.youtube.com/watch?v=tafGL02EUOA Here is the link