If I add kinetic energy and rest energy (350+135 = 485 MeV) and use this value for E my momentum seems to be to large (p = 465.83). Unless I am making another mistake in the part below.
θ = cos-1(Pc / 2E)
θ = cos-1(465.83 MeV/c) c / (2)(175 MeV)
θ = cos-1(1.33)(which cannot be )
2) A π0 of kinetic energy 350 MeV decays in flight into 2 γ rays of equal energies. Determine the angles of the γ rays from the incident π0 direction.
Not sure where I am going wrong but my answer is not correct.
Energy of π0 meson
E = 350 MeV
Rest mass Energy of π0 meson
E0 = 135...