試題詳解

13. An electron and a positron move side by side, at the same velocity of 0.8c, in the same direction on the x-axis. Finally, these two particles merge together thus annihilate each other, and two photons are generate【複選題】 
(A) These two photons move in the same direction
(B) These two photons move in opposite direction with momentum p₁ = 2.55 MeV/c, p₂ = 0.51 MeV/c
(C) These two photons move off with the energy E₁ = 1.533 MeV, E₂ = 170.36 KeV
(D) These two photons move in the same direction, with the energy E₁ = 1.55 MeV, E₂ = 0.51 MeV
(E) These two photons move off, with the wavelength m