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It is now belived that protons and neutrons (whichconstitude nuclei of ordinary matter)are themselves built out of more elementaryunitscalled quarks. A proton and a neutron consist of three quarks each. Two types of quarks, the so-called 'up'quark (denoted by u) of charges +(2)/(3) e,and the 'down' quark (denoted by d )of charges(-(1)/(3)) e,togetherwith electronsbuild up ordinary matter. (Quarks of other types have also been found which give rise to different unusual varieties of matter. ) Suggest a possible quark composition of a proton and neutron. |
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Answer» Solution :Possible quark COMPOSITION of a proton is ` 2u+1d i.e. ,u,u,d,` so that TOTAL charges on it ` =+(2)/(3) e+(2)/(3) e-(1)/(3) e=+e.` Possible quark composition of a neutron is `1mu +2d i.e. , u, d,d, `so that total charge on it. `=+(2)/(3) e, -(1)/(3) e-(1)/(3) e=0` . |
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