Problem

The highest-energy cosmic ray ever detected had an energy of about . Assume that this co...

The highest-energy cosmic ray ever detected had an energy of about . Assume that this cosmic ray was a proton.

a. What was the proton’s speed as a fraction of c?

b. If this proton started at the same time and place as a photon traveling at the speed of light, how far behind the photon would it be after traveling for 1 ly?

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Solutions For Problems in Chapter 27

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