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

Question

Quizplus · Accepted Answer

A proton consists of two up quarks and one down quark. Therefore, the only choice with this composition is uud. Choice A has three up quarks, which would result in a charge of +2, but a proton has a charge of +1. Choices C and D have only one up quark, which means the charge of the particle would be less than +1.

An Up Quark (U)has a Charge +2/3,and a Down Quark