Singapore GCE A-Level H3 Physics Practice Questions - Singapore GCE A-Level H3 Physics Examination (SEAB Syllabus 9814) Exam

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A rod of proper length L_0 moves at constant velocity v parallel to its length. Which expression correctly gives its measured length L in the observer's frame?

L = L_0 * sqrt(1 - v^2/c^2) L = L_0 / sqrt(1 - v^2/c^2) L = L_0 * (1 - v/c) L = L_0 * (1 + v^2/c^2)

Correct Answer:

L = L_0 * sqrt(1 - v^2/c^2)

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