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