Which of the following is not believed to be composed of quarks?
A) alpha particle
B) proton
C) beta particle
D) pion
E) neutron

Question

Quizplus · Accepted Answer

Beta particles are not composed of quarks; they are high-energy, high-speed electrons or positrons emitted by certain types of radioactive nuclei, such as potassium-40. The other options, such as protons, neutrons, alpha particles, and pions, are all hadrons (except for the alpha particle, which is a nucleus made of protons and neutrons) and are composed of quarks.

Which of the Following Is Not Believed to Be Composed