Conceptual Physics (12th Edition)

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

Chapter 31 - Think and Discuss: 66

Answer

Visible photons have less energy than ultraviolet photons.

Work Step by Step

Visible light has insufficient energy per photon to trigger cell damage. Bright visible light just means more photons, each of which can't cause a reaction, so it is still relatively safe. Ultraviolet light has enough energy per photon to damage the skin.
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