1. The problem statement, all variables and given/known data One of the following equations represent a possible decay of the K + kaon. K+ → π+ + π0 K+ → μ+ + νμ State, with a reason, which one of these decays is not possible. 3. The attempt at a solution At first i thought the first decay was not possible, however, i recently learned that strange quarks decay in to other quarks ( I am aware that a +kaon is made up of and up quark and anti-strange quark). I say other quarks because I'm not sure which either a strange quark or anti-strange quark decay into. After some further calculations i realised that the second decay is not possible as lepton numbers are not conserved. So request is, could i have some information on strange quark decay at an A level standard. For some reason i can't find anything in my text book.