Consider the following information from the Standard Model of Particle Physics:
- Protons and neutrons are made up of three quarks of type u and d;
- The quark u has positive electric charge equal to the modulus of the electron charge;
- A proton p consists of two quark u and one quark d, proton p = uud.
Determine the number of quarks u and quarks d of a neutron n.

Question

Consider the following information from the Standard Model of Particle Physics:
- Protons and neutrons are made up of three quarks of type u and d;
- The quark u has positive electric charge equal to the modulus of the electron charge;
- A proton p consists of two quark u and one quark d, proton p = uud.
Determine the number of quarks u and quarks d of a neutron n.

lucaz · Answer

my textbook begins with this: http://www.revista.vestibular.uerj.br/lib/spaw2/uploads/images/2011_Discursivo/2011_Disc_Fis_Comentario7.PNG

lucaz · Answer

but I don't get the 2e/3