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 - Misconceptual Questions: 5

Answer

Choice D.

Work Step by Step

The energy of the photon E is goes into ejecting the electron from the surface (the work function of the metal), and the rest goes into kinetic energy of the released electrons. If a photon has energy of 4 eV and the work function of the metal is 1.5 eV, using photons of 2 eV-- half the energy --will still eject electrons. However, if the work function were 2.1 eV (i.e., it is more than half of the photon energy), using photons of half the original energy would not eject electrons.
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