Some conservative laws are true for one fundamental force but not for other. Give two such examples
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Answer:
This is true, some conservation laws are true for one fundamental force, but not for others. Take for example strangeness. In strong and electromagnetic interactions, the “strangeness” of a particle is conserved. However, in the weak interaction, the strangeness of a particle is not conserved. This is because strangeness is related to the presence of a strange quark in a particle. Strangeness predated the discovery of the strange quark, and some scientists saw that certain easily created particles (kaons and hyperons) decayed relatively slowly for their large mass. It was later found that these particles had a strange quark (the name of the strange quark actually comes from this). The strong and electromagnetic interactions cannot change the flavor of a quark and can thus not change the strangeness of a particle. However, the weak interaction can change a quark’s flavor (by decaying the strange quark into another one) and can thus change the strangeness of a particle, making the law of conservation of strangeness only valid for strong and electromagnetic interactions.