In its own frame of reference, a proton take 5 min to cross the Milky Way
galaxy which is about 10^5 light-year in diameter.

a.What is the approximate energy of the proton in electronvolts?
b.About how long would the proton take to cross the galaxy as measured by an
observer in the galaxy's reference frame?

請問要如何計算能量?
質子速度要怎麼算?




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