Physics 212 Lecture: "Electromagnetic Waves II." Feb 18, 1998

• Because light takes time to travel large distances, when we look at a very distant object, we see it as it was some time ago.
• Although most waves require a medium through which to propagate (sound waves require air), electromagnetic waves do NOT.
• Therefore, E-M waves have a Doppler formula which is slightly different than other waves; it involves only the relative velocity of the source and observer.

This lecture discusses material in Chapter 24 of Cutnell and Johnson.

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Copyright © Michael Richmond. This work is licensed under a Creative Commons License.