The neutron sits beside the proton in every nucleus: almost the same size, but with no charge. Its quark recipe differs from the proton's by exactly one quark.
Put the two recipes side by side: the proton is uud; the neutron is udd. Where the proton has a second up quark, the neutron has a down quark.
A physicist writes down the quark content of a neutron, one letter per quark. Which letters does she write?
A neutron is made of one up quark and two down quarks.
She writes udd: u, d, d.
How many down quarks does a neutron contain? Enter the number.
A neutron's quark content is written as:
Rosa says swapping one of a proton's up quarks for a down quark gives a neutron's recipe. Is Rosa correct?
Which set of quarks makes up a neutron?
A particle's quark content reads udd. Which particle is it?
How do the quark contents of the proton and the neutron differ?