In modern particle physics, the proton and the neutron are now thought to be composed of more fundamental particles called
A) photons.
B) gluons.
C) neutrinos.
D) quarks.

Name: In modern particle physics, the proton and the neutron are now thought to be composed of more fundamental particles called A) photons. B) gluons. C) neutrinos. D) quarks.
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Protons and neutrons are composed of quarks, which are held together by the strong force, mediated by gluons.

In Modern Particle Physics, the Proton and the Neutron Are