The most energetic proton ever detected in the cosmic rays coming to Earth from space had an astounding kinetic energy of 3.0xx10^(20)eV (enough energy to warm a teaspoon of water by a few degrees). Suppose that the proton travels along a diameter of the Milky Way galaxy (9.8xx10^(4)ly). Approximately how long does the proton take to travel that diameter as measured from the common reference frame of Earth and the Galaxy?

The most energetic proton ever detected in the cosmic rays coming to E

1.	The most energetic proton ever detected in the cosmic rays coming to Earth from space had an astounding kinetic energy of 3.0xx10^(20)eV (enough energy to warm a teaspoon of water by a few degrees). Suppose that the proton travels along a diameter of the Milky Way galaxy (9.8xx10^(4)ly). Approximately how long does the proton take to travel that diameter as measured from the common reference frame of Earth and the Galaxy?
Answer» Solution :Reasoning: We just saw that this ultrarelativistic PROTON is traveling at a speed barely less than C. By the definition of light-year, light takes 1 y to travel a distance of 1 ly, and solight should take `9.8xx10^(4)y` to travel `9.8xx10^(4)ly`, and this proton should take almost the same time. Thus, from our Earth-Milky WAY REFERENCE FRAME, the proton.s trip takes `Delta = 9.8xx10^(4)y`.

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