Slick Willy is in traffic court (again) contesting a $50.00 ticket for speeding. The speed limit was v0 = 50 mph, and the police officer clocked Slick going vS W = 66 mph. However, he was caught by a police officer driving towards him, so he is arguing that although the police officer measured him to be speeding, in reality he was not. Slick Willy is assuming that the Doppler shift in electromagnetic radiation is described in the same way as the Doppler shift for sound. But note that the speed of electromagnetic radiation in air is about c = 3.0 × 108 m/s, considerably faster than the speed of sound in air

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Proper Length

The theory of special relativity explains the connection between space and time to objects that move in a straight line at a constant speed. The objects move at the speed of light. When an object approaches light speed, its mass is endless and cannot move faster than light. The most crucial postulate of Einstein's special relativity is that the laws of nature do not change in each frame of reference.