A high speed particle enters a medium and travels 7.8 mm before it decays. If the particle was travelling at 0.98c relative to the medium, what would the proper lifetime of the particle be? Give your answer in picoseconds (10^-12 s) and don't give units.

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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.