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

Answer

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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