Each of the following particles can be exchanged between two protons, two neutrons, or a neutron and a proton as part of the nuclear force. Rank the particles in order of the range of the interaction that they mediate, from largest to smallest range. (i) The π+ (pi-plus) meson, mass 140 MeV/c2; (ii) the ρ+ (rho-plus) meson, mass 776 MeV/c2; (iii) the η0 (eta-zero) meson, mass 548 MeV/c2; (iv) the ω0 (omega-zero) meson, mass 783 MeV/c2.
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