Recall that an up quark (u)has a charge of +2/3 and a down quark (d)has a charge of -1/3.Which of the following quark compositions describes a proton?
A)uuu
B)uud
C)udd
D)uuudd

Question

Quizplus · Accepted Answer

A proton is made up of two up quarks and one down quark. The quark composition for a proton is uud. Therefore, option B (uud) is the correct choice. Option A (uuu) has three up quarks and a total charge of +2, which is not consistent with a proton's charge of +1. Option C (udd) has two down quarks and one up quark, which also does not correspond to a proton's composition. Option D (uuudd) has too many quarks and is not a valid combination.

Recall That an Up Quark (U)has a Charge of +2/3