Conceptual Physics (12th Edition)

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

Chapter 31 - Think and Discuss: 67

Answer

If reddish light is used, the meter reads zero, since no electrons are ejected. More reddish light changes nothing: the meter still reads zero. As the frequency is increased and the color changes to be more blue/violet, at some point the energy per photon is sufficient to eject electrons, and the meter will give a nonzero reading. If this light intensity is increased, the meter reading increases because more electrons are ejected.

Work Step by Step

This is explained on pages 585-587.
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