Answer
Red photons have less energy than green or blue photons.
Work Step by Step
Finding sensitive materials that would respond to red photons was more difficult because they have less energy than photons of green or blue light.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 31 - Think and Discuss - Page 599: 63
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