Question
Sodium has an electron binding energy (work function) of 2.28 eV. When sodium is illuminated by electromagnetic radiation of wavelength 450 nm, determine the maximum kinetic energy of the emitted electrons in electron volts.
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Evidence boundary
This restates OpenStax College Physics, BCcampus 2016 edition, Section 29.2 Exercise 5. It uses the stated 2.28 eV work function for sodium and 450 nm incident radiation in the ordinary single-photon model. The result is a theoretical maximum, not a measured spectrum, photocurrent or material-independent work function.