Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 27 - Early Quantum Theory and Models of the Atom - Questions: 11


No, in fact fewer electrons are emitted. Yes, each emitted photon has higher kinetic energy than before.

Work Step by Step

We know that the intensity (energy delivered per second to a given area) of the light beams is the same. The higher-frequency 400-nm photons each have more energy than the 450-nm photons. There are fewer 400-nm photons hitting the surface per second, so fewer electrons are ejected per second. It still takes the same amount of energy (the work function) to eject each electron, so a higher-energy incoming photon means that the ejected electron will have more KE.
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