2025 AQA A-LEVEL PHYSICS Paper 3 Section B Astrophysics Question Paper & Mark Scheme (Merged) 2025 [VERIFIED

2025 AQA A-LEVEL PHYSICS Paper 3 Section B Astrophysics Question Paper & Mark
Scheme (Merged) 2025 [VERIFIED

, 2
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outside the




Section B
box
Answer all questions in this section.


0 1 HIP 56948 is a star with a black-body temperature of 5800 K. The star is at a distance
of 210 ly from the Sun.

0 1 . 1 Sketch, on Figure 1, the black-body curve for HIP 56948.
Label the wavelength axis with a suitable scale and unit.
[3 marks]


Figure 1




0 1 . 2 The diameter of HIP 56948 is the same as the diameter of the Sun.

Suggest a value for the absolute magnitude of HIP 56948.
[1 mark]
absolute magnitude =


0 1 . 3 Astronomers study HIP 56948 in their search for Earth-like exoplanets because
HIP 56948 is similar to the Sun.




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, 3
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Suggest one difficulty in detecting an Earth-like planet around HIP 56948.
[1 mark]

0 2 .


5




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, 4
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Draw a1 ray diagram for an astronomical telescope in normal adjustment.

Include in your diagram:
 three non-axial rays
 labelled principal foci for the lenses.

[2 marks]




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