[題目] 普物
[領域]近物
[來源]考古題
[題目]A photon γ hits to an electron
(the electron mass=m)at rest ,producing an
electron-positron pair What is the minimum
energy of incident photon
[瓶頸] 我用能量守恆
Er+mc^2=3mc^2 -->Er=2mc^2
可是答案是4mc^2
請各位幫我看一下哪裡有錯@@
謝謝~
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