Protons in cosmic rays have been observed with kinetic energies as large as 1.0 1020 eV.

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Protons in cosmic rays have been observed with kinetic energies as large as 1.0 × 1020 eV.
(a) How fast are these protons moving? Give your answer as a fraction of the speed of light.
(b) Show that the kinetic energy of a single one of these protons is much greater than the kinetic energy of a 15-mg ant walking with a speed of 8.8 mm/s?
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Physics

ISBN: 978-0321976444

5th edition

Authors: James S. Walker

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