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: 8

Answer

Electrons leaving the cesium surface have a higher maximum kinetic energy.

Work Step by Step

See equation 27-5a. An incident photon has energy, hf. Some of this energy (measured by the work function) ejects the electron from the material, and the rest gives the ejected electron some kinetic energy. Cesium has the lower work function so its ejected electrons have more KE.
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