Authors: Glenn A. Baxter
A Special Relativity practical illustration is given below where, a light pulse on a train (frame 1), the train moving with uniform motion relative to the ground (frame 2) is compared with another light pulse from an overpass (frame 2) as the pulse moves from the front to the back of the moving train itself, all in frame 1. An observer on the train (frame 1) measuring both pulse velocities in the frame of the train, measures both pulses going at the constant speed of light, c, from the front of the train car to the back of the car. However, the observer on the train car in frame 1 looking at the light pulse in frame 2, coming from frame 2, sees the pulse from frame 2 as blue shifted, and measures its relative speed of light, c’, as appearing greater than the constant speed of light, c, as measured before while looking at both pulses moving in frame 1. The pulse of light ITSELF from frame 2 is not affected whatsoever by the uniform motion. The pulse of light originated and observed on the train in frame 1 is not affected OR blue/red shifted by the uniform motion relative to the ground or any other uniform motion . This is Dr. Einstein’s Relativity Principle, which says that physics is the same INSIDE all frames, regardless of their uniform relative motion.
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