An electromagnetic wave travels in a vacuum. The
Chapter 24, Problem 24.29(choose chapter or problem)
An electromagnetic wave travels in a vacuum. The wavelength of the wave is tripled. How is this accomplished? (a) By tripling the frequency of the wave (b) By tripling the speed of the wave (c) By reducing the frequency of the wave by a factor of three (d) By reducing the speed of the wave by a factor of three (e) By tripling the magnitudes of the electric and magnetic fields that comprise the wave
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