Exam-style question
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In the twin paradox, the traveling twin experiences time dilation. What is the effect?.
- A.The traveling twin ages more.
- B.The traveling twin ages less.
- C.Both twins age equally.
- D.The traveling twin stops aging.
Model answer
What a good answer should say
- The traveling twin ages less.
Explanation
Why this works
Formula: Δt = γ Δτ. Substitution: the traveling twin’s proper time is Δτ, Earth twin’s coordinate time is Δt.
Working: Δt > Δτ, so the traveling twin’s clock runs slower. Answer: the traveling twin ages less.
Units/conclusion: The traveling twin ages less due to time dilation.
Common mistake
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