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.4.3 Chain Reactions from Fission – Check yourself

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  • Questions count: 6
  • Passing grade: B+
  • Time limit: 10 minutes
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1.
A reactor operating steadily has k equal to...
0.5
1
0.95
2
2.
Which condition makes a chain reaction die out?
k > 1
k = 1
k = 2
k < 1
3.
Why does a minimum critical mass exist?
Neutron leakage through the surface
Neutrons repel each other
U-235 is rare
Gravity binds the neutrons
4.
With k = 1.1, the number of fissions after 20 generations from 1 000 is about...
2 000
22 000
6 700
1 100 000
5.
Which would increase k?
Adding a moderator
Adding boron rods
More leakage
Impurities that absorb neutrons
6.
On average a fission gives 2.4 neutrons. For a critical reactor, how many of them must go on to cause fission?
0.4
2.4
1
24
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  • 6
Part of Theme E — Nuclear and Quantum Physics — see every lesson and quiz in this unit.
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