Passage VI

Quarks constitute 1 of the 3 classes of elementary particles that form all matter in the universe. Three quarks bound together form a type of particle called a baryon. A quark's effective mass (mass when bound to other quarks) is greater than its single-quark mass (mass when unbound). In addition, all quarks possess a property called spin. A quark's spin can be oriented in 1 of 2 directions, spin-up () or spin-down ().

Table 1 lists the symbol, electric charge, and approximate single-quark mass for each of the 6 quarks.

Table 2 gives the symbol, mass, quark content, and quark spins for several baryons.

Tables adapted from C. Amsler et al., "Review of Particle Physics." ©2008 by Elsevier B.V.

36. Which of the following diagrams represents the quark content and quark spins for an electrically neutral baryon having only 2 quark spins oriented in the same direction?

Answer and Explanation

Your Answer is

Correct Answer is G

Explanation

There are two restrictions given in the title, firstly, Baryon must be neutral and uncharged, and secondly, there must be one and only two quarks with the same spin direction, so H and J can be excluded according to the second article;

The F option quark content is uct, which corresponds to table 1. It can be found that their corresponding charges are all +2/3, and the synthesis is +2, which is positively charged. If it does not meet the first condition, it is excluded;

Bring the qurks in the G option into table 1 to calculate the charge, it can be obtained that the Baryon is neutral, so choose G