An antiproton has the same mass and rest energy (938.3 MeV) as a proton, but has a negative change -e instead of the positive charge +e of the proton. A proton and an antiproton, initially far apart, move toward each other with the same speed and collide head-on, annihilating each other and producing two photons. Find the energies and wavelengths of the photons if the initial kinetic energies of the proton and antiproton are (a) both negligible and (b) both 545 MeV.

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An antiproton has the same mass and rest energy (938.3 MeV)
as a proton, but has a negative change -e instead of the positive charge
+e of the proton. A proton and an antiproton, initially far apart, move
toward each other with the same speed and collide head-on, annihilating
each other and producing two photons. Find the energies and wavelengths
of the photons if the initial kinetic energies of the proton and
antiproton are (a) both negligible and (b) both 545 MeV.

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