IB Physics HL A 5 9 Hl Proper Time Interval and Proper Length Topic Practice

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Study A.5.9 (HL)—Proper time interval and proper length conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

Question 1

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An observer P sitting in a train moving at a speed v measures that his journey takes a time Δtp\Delta t_{\mathrm{p}}. An observer Q at rest with respect to the ground measures that the journey takes a time ΔtQ\Delta t_{\mathrm{Q}}.

State which of the two time intervals is a proper time.

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