2025 A-LEVEL PHYSICS Paper 3
Section B Astrophysics Question
Paper & Mark Scheme (Merged)
Tuesday 17 June 2025 [VERIFIED]
Time allowed: The total time for
both sections of this paper is
2 hours
...
2025 A-LEVEL PHYSICS Paper 3
Section B Astrophysics Question
Paper & Mark Scheme (Merged)
Tuesday 17 June 2025 [VERIFIED]
Time allowed: The total time for
both sections of this paper is
2 hours. You are advised to
spend approximately
50 minutes on this section.
You must answer the questions in the spaces provided. Do not write
outside the box around each page or on blank pages.
If you need extra space for your answer(s), use the lined pages at the end of
this book. Write the question number against your answer(s).
Do all rough work in this book. Cross through any work you do not want
to be marked.
Show all your working.
Information
The marks for questions are shown in brackets.
The maximum mark for this paper is 35.
You are expected to use a scientific calculator where appropriate.
A Data and Formulae Booklet is provided as a loose insert.
IB/M/Jun25/G4006/E7
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For Examiner’s Use
Question Mark
1
2
3
4
5
TOTAL
2
Do not write
outside the
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IB/M/Jun25/7408/3BA
Section B
Answer all questions in this section.
box
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.
. 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
. The diameter of HIP 56948 is the same as the diameter of the Sun.
Suggest a value for the absolute magnitude of HIP 56948.
absolute magnitude =
[1 mark]
. Astronomers study HIP 56948 in their search for Earth-like exoplanets because
HIP 56948 is similar to the Sun.
Suggest one difficulty in detecting an Earth-like planet around HIP 56948.
[1 mark]
1
2
3
5
1 0
1 0
1 0
1 0
3
Do not write
outside the
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IB/M/Jun25/7408/3BA
1 . Draw a ray diagram for an astronomical telescope in normal adjustment.
Include in your diagram:
three non-axial rays
labelled principal foci for the lenses.
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