[填空题]
(a) How much energy is released wulxf9fk/r 59 ehen an elec1kf5v4b ezx2q59m3x j-u gje;o uc9titron and a positron annihilate each other?j 9omi2-4ve5g eq;j3u 1fc u5t9zxbxk $E_{\text{total}}$= MeV
(b) How much energy is released when a proton and an antiproton annihilate each other? (All particles have $KE = 0$.) $E_{\text{total}}$ = MeV
