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IB Physics HL E 5 2 Fusion in Stars Questions

Identify HL fusion stages in stars by relating core composition, stellar evolution and the elements being fused at different stages.

Syllabus
First assessment 2025
Course
Physics HL
Level
HL

Exam points

  • identify hydrogen-to-helium fusion in main-sequence stars and determine which element is fusing at a stated evolutionary stage
  • use core and outer-layer composition evidence to distinguish main-sequence and evolved stars
  • relate observed stellar composition to the stage of stellar evolution and the fuel available for fusion

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Study E.5.2—Fusion in stars conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Physics HL E 5 2 Fusion in Stars Questions question 1

[Maximum number: 1]

Three stars A, B and C are labelled on the Hertzsprung-Russell (HR) diagram. L⊙L_{\odot} is the Luminosity of the sun.

Figure for Question IB Physics HL E 5 2 Fusion in Stars Questions question 1 — IB Physics HL

State the main element that is undergoing nuclear fusion in star C .

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