Exam-style question
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Which of the following experiments provides direct evidence that moving particles experience time dilation?.
- A.Michelson-Morley experiment
- B.Hafele–Keating experiment
- C.Muon lifetime in the upper atmosphere
- D.Observation of binary pulsars
Model answer
What a good answer should say
- Muon lifetime in the upper atmosphere
Explanation
Why this works
Evidence: Muon lifetime in the upper atmosphere. Interpretation: Muons have a known rest lifetime, but the observed lifetime is longer than expected.
Implication: Moving muons experience time dilation, extending their lifetime. Conclusion: This observation directly supports time dilation.
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