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Question 39

From Physics HL Paper 1A (May 2025, TZ3)

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  1. The HR diagram shows two stars, X and Y.
Hertzsprung-Russell diagram with luminosity on the y-axis and surface temperature on the x-axis, showing two stars X and Y on a diagonal band.
Hertzsprung-Russell diagram with luminosity on the y-axis and surface temperature on the x-axis, showing two stars X and Y on a diagonal band.

Three statements are made about star X and star Y.
I. Star X is hotter than star Y.
II. Star X has a larger radius than star Y.
III. Star X is more luminous than star Y.
Which of the statements are correct?

Textbook topics in this question

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