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.5.8 Determination of Stellar Radii – Check yourself

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  • Questions count: 6
  • Passing grade: B+
  • Time limit: 10 minutes
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1.
Which equation gives the luminosity of a star?
L = σAT
L = σAT2
L = σAT4
L = σT4/A
2.
A star has the same temperature as another but 4 times the luminosity. Its radius is...
2 times
4 times
8 times
16 times
3.
If the distance to a star doubles, its apparent brightness...
halves
doubles
is unchanged
quarters
4.
The peak wavelength of a star is 1450 nm. Its temperature is about...
200 K
2 000 K
20 000 K
1.45 × 106 K
5.
A star with half the temperature of the Sun and the same luminosity has a radius about...
2 times that of the Sun
8 times
16 times
4 times that of the Sun
6.
Which two measurements are needed, besides distance, to find the radius of a star?
Apparent brightness and peak wavelength
Mass and age
Parallax and colour of the sky
Density and spin
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Part of Theme E — Nuclear and Quantum Physics — see every lesson and quiz in this unit.
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