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How do you know the speed of an electromagnetic wave in a vacuum?
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How do you know the speed of an electromagnetic wave in a vacuum?

User Jay Souper
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The speed of electromagnetic waves in a vacuum is the same as the speed of light. It can be measured by finding the frequency and wavelength of two different waves, and then by that correlation, the speed of the waveform.
Hope this helps you (:
User Wasker
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