9. Which of the following was Einstein’s Second Postulate to the Special Theory of Relativity? The laws of physics are the same in all frames of reference that are moving uniformly. Waves had to have some medium to travel through. A beam of light that traveled parallel to the aether would take longer than the beam that traveled perpendicularly to the aether. The speed of light is constant and is independent of the motion of the source or the observer.

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