Which force is the only one that can change one type of quark into another?
Quick Answer
The weak nuclear force can change quark flavour, turning one type into another. That is why it can cause radioactive beta decay.
The Full Story
The weak force uniquely changes particle identity at the quark level. For example, in beta-minus decay, a down quark inside a neutron can turn into an up quark, converting the neutron into a proton. This process is mediated by the W boson and is essential in many nuclear reactions and in the life cycle of stars. No other fundamental force changes one quark flavour into another. This property makes the weak interaction central to particle physics and nuclear transformation.
Key Facts
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