A clock in a spaceship moving at 0.8c records 10 s (proper time). An Earth observer measures the interval as:

  1. 33.3 s
  2. 167 s
  3. 8.33 s
  4. 16.7 s
Answer

D) 16.7 s

t = γ t₀ = 10/(√(1 - 0.8²)) = 16.7 s. SLO P-11-F-05 · Understanding

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