E = Ek + E0 = eU + E0
E2 = p2 c2 + E02
E0 = m0 c2
联立,导出 p
代入 λ = h / p算了答案不对，标准答案是v=1.24*10^8m/s，λ =5.36*10^-2nm可以算出p = 1.2364*10^-22
λ = 5.359*10^-12 m , (答案λ =5.36*10^-2nm错)
由 γ = E / E0 = (E0 + eU) / E0 得， γ =1.09757
速度 v = c*(1 - 1 /γ^2) = 1.237*10^8 m/s(答案对)