A particle called neutral pi meson (or pion) decays into two photons and nothing else. If the pion (whose rest mass is 135Mev) is initially at rest (a) what are the energies of the photons?
(b)what are the magnitudes of the momenta of the photons?
(c) How are they moving with respect to each other
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See here:
http://www.jiskha.com/display.cgi?id=1307471410