Curriculum
Course: IB Physics HL
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Curriculum

IB Physics HL

Theme A — Space, Time and Motion

0/125 Dr Dabour Hub Science Diagram and Course Material

Theme B — The Particulate Nature of Matter

0/105 Dr Dabour Hub Science Diagram and Course Material

Theme C — Wave Behaviour

0/73 Dr Dabour Hub Science Diagram and Course Material

Theme D — Fields

0/77 Dr Dabour Hub Science Diagram and Course Material

Theme E — Nuclear and Quantum Physics

0/89 Dr Dabour Hub Science Diagram and Course Material

Tools and Inquiry — IB Physics skills

0/43 Dr Dabour Hub Science Diagram and Course Material
Quiz

A.5.7 Time Dilation – Check yourself

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  • Questions count: 6
  • Passing grade: B+
  • Time limit: 10 minutes
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1.
Which formula describes time dilation?
Δt = Δt₀ − γ
Δt = γ2Δt₀
Δt = Δt₀/γ
Δt = γΔt₀
2.
The proper time interval is measured by
any observer
a clock at rest relative to the events, present at both
two synchronised clocks
a clock moving at c
3.
At v = 0.6c a clock ticks off 8.0 s in its rest frame. In the lab this lasts
6.4 s
8.0 s
10 s
12.5 s
4.
A muon has proper lifetime 2.2 μs and γ = 5. Its lifetime seen in the lab is
11 μs
2.2 μs
7.2 μs
0.44 μs
5.
Why is the twin paradox not a true paradox?
Clocks stop at c
Time dilation is false
The travelling twin accelerates, so the situation is asymmetric
Both twins are in the same frame
6.
Time dilation in the light clock arises because
light slows down
the light path is longer in the observer's frame while c is unchanged
the mirrors shrink
the clock is faulty
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Part of Theme A — Space, Time and Motion — see every lesson and quiz in this unit.
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