A clock in a spaceship moving at 0.6c records 2 s (proper time). An Earth observer measures the interval as:

  1. 5 s
  2. 25 s
  3. 1.25 s
  4. 2.5 s
Answer

D) 2.5 s

t = gamma t0 = 2 1 - 0.6^2 = 2.5 s. SLO P-11-F-05 · Understanding

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