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Back to 29.2 The Photoelectric Effect

Unreasonable Results

Avg difficulty 2.5

Red light having a wavelength of 700 nm is projected onto magnesium metal to which electrons are bound by 3.68 eV. (a) Use KE e=hf–BE\text{KE }_{e} = \text{hf} – \text{BE} to calculate the kinetic energy of the ejected electrons. (b) What is unreasonable about this result? (c) Which assumptions are unreasonable or inconsistent?

OpenStax College Physics 2e, 29.2 The Photoelectric Effect, exercise 22

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Adapted from College Physics © 2022 Rice University. Licensed under CC BY 4.0. Sources: College Physics 2e, College Physics for AP® Courses 2e. Imported at revision f98d7a7.