Curriculum
Course: IB Physics SL
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Curriculum

IB Physics SL

Theme A — Space, Time and Motion

0/80 Dr Dabour Hub Science Diagram and Course Material

Theme B — The Particulate Nature of Matter

0/87 Dr Dabour Hub Science Diagram and Course Material

Theme C — Wave Behaviour

0/60 Dr Dabour Hub Science Diagram and Course Material

Theme D — Fields

0/41 Dr Dabour Hub Science Diagram and Course Material

Theme E — Nuclear and Quantum Physics

0/59 Dr Dabour Hub Science Diagram and Course Material

Tools and Inquiry — IB Physics skills

0/54 Dr Dabour Hub Science Diagram and Course Material
Quiz

E.5.1 Fusion Reactions in Stars – Check yourself

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  • Questions count: 6
  • Passing grade: B+
  • Time limit: 10 minutes
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1.
What is the net result of the proton–proton chain?
Four protons form one helium-4 nucleus
One helium nucleus splits
Carbon forms uranium
Neutrons become electrons
2.
Why is a high temperature needed for fusion?
To make nuclei radioactive
To make neutrons
To overcome electrostatic repulsion
To increase the strong force
3.
Stars are stable because of a balance between...
gravity and magnetism
gravity and gas/radiation pressure
strong and weak forces
electrons and neutrons
4.
Beyond which nucleus does fusion stop releasing energy?
Helium-4
Carbon-12
Uranium-235
Iron-56
5.
The mean energy of particles at 107 K is about 1 keV, but fusion occurs. This is mainly because of...
gravity
the weak force
tunnelling and the high-energy tail of the distribution
radioactive decay
6.
The slowest step in the proton–proton chain, controlling the Sun's lifetime, involves...
the strong force
the weak interaction
gravity
electromagnetic radiation
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Part of Theme E — Nuclear and Quantum Physics — see every lesson and quiz in this unit.
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