Modern Physics
Modern Physics
2nd Edition
ISBN: 9780805303087
Author: Randy Harris
Publisher: Addison Wesley
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Chapter 3, Problem 7CQ
To determine

The reason for not considering the photon momentum in the photoelectric effect.

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The attatched equation describes the cross section for the photoionization of a hydrogen atom in quantum state n by a photon of wavelength λ. What is the photoionization cross section for a 13.6 eV photon on hydrogen? (Provide an answer in megabarns. A barn is a unit of area commonly used in particle physics that's 10-28 m2).
A 2.0-mW green laser ( λ = 532 nm) shines on a cesium photocathode (Φ =1.95 eV). Assume an efficiency of 10-5 for producing photoelectrons (that is, one photoelectron produced for every 105 incident photons) and determine the photoelectric current
Compare the photoelectric and Compton effects in terms of photon -electron interaction processes and describe their energy and atomic number dependence at diagnostic x-ray energies.
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