College Physics (7th Edition)

Published by Pearson
ISBN 10: 0-32160-183-1
ISBN 13: 978-0-32160-183-4

Chapter 28 - Quantum Mechanics and Atomic Physics - Learning Path Questions and Exercises - Conceptual Questions - Page 962: 15

Answer

In pair annihilation, two photons are created because momentum conservation requires that the total momentum be zero. The two photons must travel in exactly opposite directions for the momenta to add to zero afterward.

Work Step by Step

In pair annihilation, two photons are created because momentum conservation requires that the total momentum be zero. The two photons must travel in exactly opposite directions for the momenta to add to zero afterward.
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