阿摩線上測驗
14. What is the energy of each photon produced by positron–electron annihilation? (c is the speed of the light; m₀ is the mass of electron at rest.)
(A) 12 m₀c²
(B) 6 m₀c²
(C) 2 m₀c²
(D) m₀c²
(E) 
m₀c²
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統計： A(0), B(0), C(0), D(0), E(1) #3853529
統計： A(0), B(0), C(0), D(0), E(1) #3853529
