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140. It is now known that protons and neutrons are themselves build out of elementary unit called quark . the up quark (u) has a charge +2e/3 and down quark (d) has charge -e/3. the composition of proton and neutron can be. (1) uud,udd (2) udd,uud (3) ddd,uuu (4) uuu,ddd

Answer» 140. It is now known that protons and neutrons are themselves build out of elementary unit called quark . the up quark (u) has a charge +2e/3 and down quark (d) has charge -e/3. the composition of proton and neutron can be. (1) uud,udd (2) udd,uud (3) ddd,uuu (4) uuu,ddd


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