Exam-style question
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Which observation is used to correct the timekeeping of GPS satellites for relativistic effects?.
- A.Muon lifetime
- B.Hafele–Keating experiment
- C.Michelson-Morley null result
- D.Length contraction of satellite orbits
Model answer
What a good answer should say
- Hafele–Keating experiment
Explanation
Why this works
Evidence: Hafele–Keating experiment. Interpretation: Atomic clocks flown on aircraft recorded time differences compared to ground clocks.
Implication: Moving clocks run slower, requiring correction. Conclusion: The experiment provides evidence for time dilation used in GPS satellite calibration.
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