# Strong or weak force??

by R0CC0
Tags: force, strong, weak
 P: 18 1. The problem statement, all variables and given/known data So all I want to know is how you tell if it is a strong or weak force interaction. e.g. K^+ = pi^0 + pi^0 + pi^+ (all mesons) So i determined that the energy was concerved: 493.7-135-135-139.6=84.1MeV baryon and Lepton numbers are also conserved (0)=(0) Now having determined that the interaction is possible, how do I tell if it is via strong or weak force.
 P: 39 The key here is to look at the quark content of the reactants and products. A positive kaon has an up and an anti-strange quark. Yet none of the pions contain a strange/anti-strange quark. What is the only interaction capable of changing the flavour of quarks?
 P: 18 So in this case weak force?
P: 39

## Strong or weak force??

 Quote by R0CC0 So in this case weak force?
The weak force is the only interaction that can change the flavour of a quark. The strong force can't.
 P: 18 Righto Got it now. Thanks!

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