IB Physics HL A.5.9 Proper time interval and proper length Question Bank

Practise IB Physics HL A.5.9 by applying proper time interval and proper length concepts to exam-style physics questions.

Exam points

identify the relevant physical quantity, model or diagram
apply the correct equation and units to the evidence
justify the result using conservation laws, forces or energy relationships

[Maximum number: 1]

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

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

$\Delta t_{\mathrm{P}} /$ observer sitting in the train

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A.5.9 (HL)—Proper time interval and proper length question 1