The highest-energy cosmic ray ever detected had an energy of about (3.0 times 10^{20} mathrm{eV}). Assume that
Question:
The highest-energy cosmic ray ever detected had an energy of about \(3.0 \times 10^{20} \mathrm{eV}\). 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 \(1 \mathrm{ly}\) ?
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Related Book For 
College Physics A Strategic Approach
ISBN: 9780321907240
3rd Edition
Authors: Randall D. Knight, Brian Jones, Stuart Field
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