cse • paper_1 • mechanics
[UPSC CSE 2007] Special Theory of Relativity (Q382, 10M)
An unstable particle has a lifetime of 5\text{ }\mu\text{s} in its own frame of reference and is moving towards the earth at a speed of 0.8\text{ C}. What will be the lifetime of the particle to an observer on the earth ?
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