Solved: The cosmic rays of highest energy are protons that
Chapter 26, Problem 26.54(choose chapter or problem)
The cosmic rays of highest energy are protons that have kinetic energy on the order of 1013 MeV. (a) How long would it take a proton of this energy to travel across the Milky Way galaxy, having a diameter _ 105 light-years, as measured in the protons frame? (b) From the point of view of the proton, how many kilometers across is the galaxy?
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