Exam-style question
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Why was the null result of the Michelson–Morley experiment considered a turning point for the development of special relativity?.
Model answer
What a good answer should say
- Because it contradicted the ether theory and showed that light speed is invariant, it forced physicists to reconsider the foundations of mechanics and led Einstein to formulate the postulates of special relativity.
Explanation
Why this works
Rule: The null result indicates that the speed of light is independent of the motion of the source or observer. Substitution: None.
Working: This contradicts the ether hypothesis and suggests that classical mechanics cannot explain light propagation. Answer: The result was a turning point because it undermined the ether model and paved the way for Einstein’s postulates.
Units/Conclusion: The conclusion is that the experiment provided empirical evidence for the constancy of light speed, a cornerstone of special relativity.
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