A sodium light source moves in a horizontal circle at a constant speed of 0.100c while emitting light at the proper wavelength of l0 = 589.00 nm. Wavelength l is measured for that light by a detector fixed at the center of the circle.What is the wavelength shift l - l0?

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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.