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

E.3.7 The Law of Radioactive Decay – Check yourself

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  • Questions count: 6
  • Passing grade: B+
  • Time limit: 10 minutes
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1.
Which expression gives the activity at time t?
A0 eλt
A0 e−λt
A0 − λt
A0 / λt
2.
The gradient of a graph of ln A against t is...
λ
1/λ
−1/λ
−λ
3.
After a time t = 1/λ, the fraction of nuclei remaining is...
1/e
½
e2
zero
4.
A sample with λ = 0.10 s−1 has N0 = 5 000. How many remain after 10 s? (e−1 = 0.37)
500
3 700
1 850
4 500
5.
Which time is longest for a given nuclide?
Time constant 1/λ
Half-life
Time to reach 75 % remaining
Time to reach 90 % remaining
6.
The time taken for activity to fall to 1/8 of its original value is...
T½/8
8 T½
3 T½
e T½
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Part of Theme E — Nuclear and Quantum Physics — see every lesson and quiz in this unit.
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