Chemistry: The Molecular Science (5th Edition)

Published by Cengage Learning
ISBN 10: 1285199049
ISBN 13: 978-1-28519-904-7

Chapter 5 - Electron Configurations and the Periodic Table - Questions for Review and Thought - Topical Questions - Page 240a,: 20

Answer

The wavelength, not the intensity, must be changed.

Work Step by Step

Changing the intensity of the light will be ineffective, for the light must have a minimal amount of energy to cause electrons to be ejected. Since the wavelength, not the intensity, affects energy, changing intensity will not fix the problem.
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