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Back to 29.3 Photon Energies and the Electromagnetic Spectrum

29.3 Exercise 1

Avg difficulty 2.5

A microwave oven produces electromagnetic radiation in the radio portion of the spectrum. These microwave photons are absorbed by water molecules, resulting in an increase in the molecules’ rotational energies. This added energy is transferred by heat to the surrounding food, which as a result becomes hot very quickly. If the energy absorbed by a water molecule is 1.0 × 10–5 eV, what is the corresponding wavelength of the microwave photons?

  1. 1.22 GHz
  2. 2.45 GHz
  3. 4.90 GHz
  4. 9.80 Hz

OpenStax College Physics 2e, 29.3 Photon Energies and the Electromagnetic Spectrum, exercise 1

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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.