Final answer:
To determine if the A particle could be an excited state of the proton, we can compare their quark compositions. The proton is composed of two up quarks and one down quark (uud). If the A particle shares the same quark composition, then it could be an excited state of the proton.
Step-by-step explanation:
In exercise 27.14, we were asked to verify the quark composition of the A particle. We can apply the same concept to determine if the A particle could be an excited state of the proton. The proton is composed of two up quarks and one down quark (uud). If the A particle has the same quark composition, then it could be an excited state of the proton.