[填空题]
A negative muon traveling6xwc8 i,,/38ktn/bo 5 vysu*hbkic4 onot f9i at 33% the6dy j3k) gsf,e/ w3tia speed of light collides head on with a positive muon traveling at 50% the speed of light. The two muons (each of rest ma ki)f/3s3y 6w gteadj,ss $m_\mu = 105.7 \, \text{MeV}/c^2$) annihilate, and produce how much electromagnetic energy?E = MeV
