Exam-style question
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Which statement best describes time dilation for moving observers?.
- A.Moving clocks run faster than stationary clocks.
- B.Moving clocks run slower than stationary clocks.
- C.Moving clocks run at the same rate as stationary clocks.
- D.Moving clocks stop running.
Model answer
What a good answer should say
- Moving clocks run slower than stationary clocks.
Explanation
Why this works
Formula: Δt = γ Δτ. Substitution: for a typical moving observer, let v = 0.8c, then γ = 1/√(1–(0.8)²) ≈ 1.666.
Working: Δt = 1.666 Δτ. Answer: the moving clock takes 1.666 times longer to tick one second, so it runs slower.
Units/conclusion: Time dilation causes moving clocks to run slower relative to stationary observers.
Common mistake
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