An electron of beta = 0.999 987 moves along the axis of an evacuated tube that has a length of 3.00 m as measured by a laboratory observer S at rest relative to the tube.An observer S who is at rest relative to the electron, however, would see this tube moving with speed v (=bc).What length would observer S' measure for the tube?

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Q: An observer in reference

A: 2.29×10-4 s

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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.