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.5.3 Star Formation – Check yourself

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  • Questions count: 6
  • Passing grade: B+
  • Time limit: 10 minutes
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1.
What causes a protostar to heat up?
Fusion
Conversion of gravitational potential energy
Radioactive decay
Chemical reactions
2.
Hydrogen fusion starts in a protostar when the core reaches about...
103 K
105 K
1012 K
107 K
3.
An object of 0.05 solar masses is most likely a...
brown dwarf
red giant
white dwarf
neutron star
4.
Why do planets form in a disc?
Gravity is weaker at the poles
Magnetic repulsion
Conservation of angular momentum flattens the collapsing cloud
Fusion pushes material outward
5.
The star reaches the main sequence when...
gravity and pressure balance with core fusion
the cloud is first formed
the star runs out of fuel
the disc disappears
6.
Compared with a star of 1 solar mass, a star of 20 solar masses on the main sequence has a...
longer life
same life
shorter life
life of zero
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Part of Theme E — Nuclear and Quantum Physics — see every lesson and quiz in this unit.
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