Question: Which of the following processes are allowed in electromagnetic interactions and which are allowed in weak interactions via the exchange of a single W

Which of the following processes are allowed in electromagnetic interactions and which are allowed in weak interactions via the exchange of a single W^± or Z⁰?

(a) K⁺ → π⁰ + e⁺ + ν_e, (b) K⁺ → π⁺ + e⁺ + e⁻, (c) Σ⁰ → Λ⁰ + e⁺ + e⁻, (d) Σ⁰ → n + ν_e + ν̅_e.

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