Exam-style question
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In a relativity problem, which length is measured in the rest frame of the moving object?.
- A.Proper length
- B.Contracted length
- C.Length in observer's frame
- D.Length after acceleration
Model answer
What a good answer should say
- Proper length
Explanation
Why this works
Formula: L = L0 √(1 - v²/c²). Substitution: L0 is the proper length.
Working: L = L0 √(1 - v²/c²). The proper length is the length measured in the object's rest frame.
Units: length. Conclusion: Proper length is measured in the rest frame of the moving object.
Common mistake
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