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How do you recognise a weak interaction?
Neutrinos involved
Quark flavour change.

How do you recognise EM interaction?
Real photon emitted/absorbed
Lfetime 10⁻¹⁶–10⁻²⁰ s.
How do you recognise strong interaction?
Quark flavour conserved
Lifetime <10⁻²⁰ s.
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