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IB Physics SL E 5 5 Hr Diagram Regions Questions

Interpret SL HR-diagram regions and constant-radius lines, combining luminosity, temperature, mass and density evidence for stars.

Syllabus
First assessment 2025
Course
Physics SL
Level
SL

Exam points

  • identify main-sequence and evolved-star regions on an HR diagram and sketch an evidence-consistent evolutionary path
  • use constant-radius lines, luminosity and temperature to compare stellar sizes
  • combine the mass–luminosity relation with radius or volume ratios to calculate and compare stellar densities

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Study E.5.5—HR diagram regions conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Physics SL E 5 5 Hr Diagram Regions Questions question 1

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The diagram shows a simplified energy-balance model for the Earth surface–atmosphere system.

Figure for Question IB Physics SL E 5 5 Hr Diagram Regions Questions question 1 — IB Physics SL

The following data are given:

 Average albedo of Earth =0.30 Average global temperature of the surface =288 K Average Earth-Sun distance =1.5×1011 m\begin{aligned} \text { Average albedo of Earth } & =0.30 \\ \text { Average global temperature of the surface } & =288 \mathrm{~K} \\ \text { Average Earth-Sun distance } & =1.5 \times 10^{11} \mathrm{~m} \end{aligned}

The positions of the Sun and the star Antares are shown in the Hertzsprung-Russell (HR) diagram.

Figure for Question IB Physics SL E 5 5 Hr Diagram Regions Questions question 1 — IB Physics SL

State the star type of Antares.

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