Exam-style question
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Which observation from the Michelson-Morley experiment contradicts the ether theory?.
- A.Constant interference pattern regardless of Earth's motion
- B.Variation in interference pattern with Earth's rotation
- C.Increase in light speed when moving eastward
- D.Decrease in light speed when moving westward
Model answer
What a good answer should say
- Constant interference pattern regardless of Earth's motion
Explanation
Why this works
Rule: Ether theory predicts a measurable shift in interference fringes due to Earth's motion through ether. Substitution: Assume Earth's motion through ether.
Working: Expected shift, but none observed. Answer: Contradicts ether theory.
Conclusion: Supports constant light speed.
Common mistake
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