# Question

(a) The minimum photon energy to create a proton–antiproton pair is (1) more than, (2) the same as, or (3) less than the minimum photon energy to create a neutron–antineutron pair. Explain.

(b) Calculate minimum photon frequency to create the proton–antiproton pair and the neutron–antineutron pair (to four significant figures).

(b) Calculate minimum photon frequency to create the proton–antiproton pair and the neutron–antineutron pair (to four significant figures).

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