Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 31 - Think and Explain: 33

Answer

The red beam has more photons.

Work Step by Step

For photons, E = hf, where E is the energy, h is Planck's constant, and f is the photon's vibrational frequency. Red light has a lower frequency f than blue light does. The red beam carries less energy per photon. Both beams have exactly the same energy. Therefore, the red beam contains more photons than the blue beam.
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