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

Practise IB Physics HL A.5.9 by identifying proper time and proper length in the correct rest frame, then applying them to relativistic comparisons.

Exam points

Identify proper time and proper length as invariant measurements in the rest frame.
Apply time dilation and length contraction to calculate observed intervals using complete mark-scheme evidence.

[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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IB Physics HL A 5 9 Hl Proper Time Interval and Proper Length Questions question 1