IB Physics HL A.5.11 Length contraction Question Bank
Practise IB Physics HL A.5.11 by applying length contraction concepts to exam-style physics questions.
- Syllabus
- First assessment 2025
- Course
- Physics HL
- Level
- HL
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
A.5.11 (HL)—Length contraction question 1
[Maximum number: 2]
An observer P sitting in a train moving at a speed v measures that his journey takes a time Δtp. An observer Q at rest with respect to the ground measures that the journey takes a time ΔtQ.
Later the train is travelling at a speed of 0.60 c . Observer P measures the length of the train to be 125 m . The train enters a tunnel of length 100 m according to observer Q .
Show that the length of the train according to observer Q is 100 m .
γ=1.25
«length of train according Q»=125/1.25
«giving 100 m»
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