Question: A subatomic particle has an unknown lifetime t. The particle is created at t = 0 and travels around the Earths equator at speed 0.999c.

A subatomic particle has an unknown lifetime t. The particle is created at t = 0 and travels around the Earth’s equator at speed 0.999c. If the particle decays at the moment it completes one trip around the Earth, what is  τ?


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