Observer a Sees a Ruler Moving by in a Relativistic $L A < L _ { B }$

question 110

Multiple Choice

Observer A sees a ruler moving by in a relativistic rocket and measures its length to be LA. Observer B moves along with the rocket and measures the length of the ruler to be LB. What is true
About these two length measurements?

• A) \(L A < L _ { B }\)
• B) \(L _ { A } > L _ { B }\)
• C) \(L _ { A } = L _ { B }\)
• D) \(L _ { A }\) could be greater or smaller than \(L _ { B }\) depending on the direction of the motion.

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