Identify particle A.

(i) Identify the interaction whose exchange particle is represented by B.

(ii) Identify the exchange particle labelled C.

Outline how the concept of strangeness applies to the decay of a K⁺ meson shown in this Feynman diagram.

\(\pi \)^- / antiparticle of \(\pi \)⁺

Do not award mark if sign is omitted.

(i) (electro) weak;

(ii) gluon/photon;

strangeness is not conserved (in interaction B therefore it is a weak interaction);
strangeness is conserved in interaction C/in strong and electromagnetic interactions;