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Back to 24.4 Energy in Electromagnetic Waves

24.4 Exercise 11

Avg difficulty 2.5

Suppose a source of electromagnetic waves radiates uniformly in all directions in empty space where there are no absorption or interference effects. (a) Show that the intensity is inversely proportional to r2r^{2}, the distance from the source squared. (b) Show that the magnitudes of the electric and magnetic fields are inversely proportional to rr.

OpenStax College Physics 2e, 24.4 Energy in Electromagnetic Waves, exercise 11

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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.