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How can the speed of light be the same for everyone, regardless of their state of motion? First, investigate how the speed of light is determined. Next, consider the hypothesized medium for light propagation—the aether—which was dealt a fatal blow by the Michelson-Morley experiment in the 1880s. Finally, examine laboratory proof that the speed of light is constant for all observers.

This video is lecture six from the series "The Evidence for Modern Physics: How We Know What We Know"
Stream the full series now on Wondrium. http://www.Wondrium.com/YouTube

00:00 How Do We Measure the Speed of Light?
06:27 Proving the Speed of Light is Uniform for All Observers
11:11 Maxwell's Equations and Electromagnetism
12:52 The Michelson—Morley Experiment
19:15 Particle Accelerator Offers Further Proof for Speed of Light
23:41 Is the Speed of Light the Same for All Wavelengths?

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