An electromagnetic wave travels in a vacuum. The wavelength of the wave is tripled. How is this

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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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Physics

ISBN: 978-1118486894

10th edition

Authors: David Young, Shane Stadler

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