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- https://phys.libretexts.org/Courses/Prince_Georges_Community_College/PHY_2040%3A_General_Physics_III/10%3A_Nuclear_Physics_and_Radioactivity/10.1%3A_The_NucleusNuclear size is defined by nuclear radius; nuclear density can be calculated from nuclear size.
- https://phys.libretexts.org/Bookshelves/University_Physics/University_Physics_(OpenStax)/University_Physics_III_-_Optics_and_Modern_Physics_(OpenStax)/11%3A_Particle_Physics_and_Cosmology/11.02%3A_Introduction_to_Particle_PhysicsThe four fundamental forces of nature are, in order of strength: strong nuclear, electromagnetic, weak nuclear, and gravitational. Quarks interact via the strong force, but leptons do not. Both quark ...The four fundamental forces of nature are, in order of strength: strong nuclear, electromagnetic, weak nuclear, and gravitational. Quarks interact via the strong force, but leptons do not. Both quark and leptons interact via the electromagnetic, weak, and gravitational forces. Elementary particles are classified into fermions and boson. Fermions have half-integral spin and obey the exclusion principle. Bosons have integral spin and do not obey this principle.
- https://phys.libretexts.org/Courses/Prince_Georges_Community_College/General_Physics_I%3A_Classical_Mechanics/64%3A_The_Standard_Model/64.03%3A_ForcesSome physicists believe that it may be possible to show that all four forces (including gravity) are aspects of a single underlying force, and covered by a theory called the "Theory of Everything". Su...Some physicists believe that it may be possible to show that all four forces (including gravity) are aspects of a single underlying force, and covered by a theory called the "Theory of Everything". Such a theory (which is essentially a grand unified theory plus gravity) has not yet been found, nor is it known whether such a theory even exists.
- https://phys.libretexts.org/Bookshelves/University_Physics/Physics_(Boundless)/30%3A_Nuclear_Physics_and_Radioactivity/30.1%3A_The_NucleusNuclear size is defined by nuclear radius; nuclear density can be calculated from nuclear size.
- https://phys.libretexts.org/Bookshelves/College_Physics/College_Physics_1e_(OpenStax)/33%3A_Particle_Physics/33.02%3A_The_Four_Basic_ForcesThere are only four distinct basic forces in all of nature. This is a remarkably small number considering the myriad phenomena they explain. Particle physics is intimately tied to these four forces. C...There are only four distinct basic forces in all of nature. This is a remarkably small number considering the myriad phenomena they explain. Particle physics is intimately tied to these four forces. Certain fundamental particles, called carrier particles, carry these forces, and all particles can be classified according to which of the four forces they feel.
