Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
A-level 2025 A-LEVEL PHYSICS Paper 3
Section B Astrophysics Question
PHYSICS Paper & Mark Scheme (Merged)
Tuesday 17 June 2025 [VERIFIED]
Paper 3
Section B Astrophysics
Tuesday 17 June 2025 Morning
Time allowed: The total time for
Materials both sections of this paper is
For this paper you must have:
a pencil and a ruler 2 hours. You are advised to
a scientific calculator spend approximately
a Data and Formulae Booklet 50 minutes on this section.
a protractor.
Instructions
Use black ink or black ball-point pen. For Examiner’s Use
Fill in the boxes at the top of this page.
Question Mark
Answer all questions.
You must answer the questions in the spaces provided. Do not write 1
outside the box around each page or on blank pages. 2
If you need extra space for your answer(s), use the lined pages at the end of 3
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 4
to be marked. 5
Show all your working.
TOTAL
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.
7 408/3BA
for more : tyrionpapers.com
IB/M/Jun25/G4006/E7
, 2
Do not write
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.
Suggest one difficulty in detecting an Earth-like planet around HIP 56948.
[1 mark]
5
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IB/M/Jun25/7408/3BA
, 3
Do not write
outside the
0 2 . 1 Draw a ray diagram for an astronomical telescope in normal adjustment. box
Include in your diagram:
three non-axial rays
labelled principal foci for the lenses.
[2 marks]
Question 2 continues on the next page
Turn over ►
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IB/M/Jun25/7408/3BA
, 4
Do not write
outside the
0 2 . 2 An astronomer has two telescopes A and B. box
The astronomer uses each telescope to make observations of Mars when Mars
is 0.55 AU from the Earth.
Table 1 gives information about A and B.
Table 1
Telescope Type Objective diameter / m Angular magnification
A refractor 0.12 25
B reflector 0.18 40
diameter of Mars = 6.8 × 103 km
angular resolution of the eye ≈ 3 × 10−4 rad
Compare the images formed by A and B.
In your answer, refer to:
the relative brightness of the images
the ability of each telescope to show features on Mars
the effect of any aberrations caused by each type of telescope.
[6 marks]
for more: tyrionpapers.com
IB/M/Jun25/7408/3BA
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
A-level 2025 A-LEVEL PHYSICS Paper 3
Section B Astrophysics Question
PHYSICS Paper & Mark Scheme (Merged)
Tuesday 17 June 2025 [VERIFIED]
Paper 3
Section B Astrophysics
Tuesday 17 June 2025 Morning
Time allowed: The total time for
Materials both sections of this paper is
For this paper you must have:
a pencil and a ruler 2 hours. You are advised to
a scientific calculator spend approximately
a Data and Formulae Booklet 50 minutes on this section.
a protractor.
Instructions
Use black ink or black ball-point pen. For Examiner’s Use
Fill in the boxes at the top of this page.
Question Mark
Answer all questions.
You must answer the questions in the spaces provided. Do not write 1
outside the box around each page or on blank pages. 2
If you need extra space for your answer(s), use the lined pages at the end of 3
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 4
to be marked. 5
Show all your working.
TOTAL
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.
7 408/3BA
for more : tyrionpapers.com
IB/M/Jun25/G4006/E7
, 2
Do not write
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.
Suggest one difficulty in detecting an Earth-like planet around HIP 56948.
[1 mark]
5
for more: tyrionpapers.com
IB/M/Jun25/7408/3BA
, 3
Do not write
outside the
0 2 . 1 Draw a ray diagram for an astronomical telescope in normal adjustment. box
Include in your diagram:
three non-axial rays
labelled principal foci for the lenses.
[2 marks]
Question 2 continues on the next page
Turn over ►
for more: tyrionpapers.com
IB/M/Jun25/7408/3BA
, 4
Do not write
outside the
0 2 . 2 An astronomer has two telescopes A and B. box
The astronomer uses each telescope to make observations of Mars when Mars
is 0.55 AU from the Earth.
Table 1 gives information about A and B.
Table 1
Telescope Type Objective diameter / m Angular magnification
A refractor 0.12 25
B reflector 0.18 40
diameter of Mars = 6.8 × 103 km
angular resolution of the eye ≈ 3 × 10−4 rad
Compare the images formed by A and B.
In your answer, refer to:
the relative brightness of the images
the ability of each telescope to show features on Mars
the effect of any aberrations caused by each type of telescope.
[6 marks]
for more: tyrionpapers.com
IB/M/Jun25/7408/3BA
