Conceptual Physics (12th Edition)

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

Chapter 30 - Think and Explain: 33

Answer

Each photon of ultraviolet light has more energy.

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. A higher-frequency uv photon has more energy than a visible-light photon. A high-energy ultraviolet photon causes particular chemical changes in the skin that even a large number of visible photons cannot accomplish.
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