A-level PHYSICS
7408/3BA
ACTUAL 2025
PAPER MERGED
WITH MARK
SCHEME
Paper 3
Section B Astrophysics
Please write clearly in block capitals.
Candidate number
Centre number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
A-level PHYSICS
Paper 3
Section B Astrophysics
Tuesday 17 June 2025 Morning Time allowed: The total time for
both sections of this paper is 2
Materials hours. You are advised to spend
For this paper you must have:
• a pencil and a ruler approximately
• a scientific calculator 50 minutes on this section.
• a Data and Formulae Booklet • a protractor.
for more: tyrionpapers.com
, 2
Do not
write
outside the
Instructions For Examiner’s Use
• Use black ink or black ball-point pen.
• Fill in the boxes at the top of this page. Question Mark
• Answer all questions.
1
• You must answer the questions in the spaces provided. Do not write 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 to be 4
marked. 5
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.
*JUN2574083BA01*
IB/M/Jun25/G4006/E7
7408/3BA
• Show all your working.
for more: tyrionpapers.com
IB/M/Jun25/7408/3BA
, 3
Do not
Section B write
outside the
box
0 1 Answer all questions in this section. box
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.
.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
.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.
0[1 mark]
1
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]
Turn over ►
5
for more: tyrionpapers.com
IB/M/Jun25/7408/3BA
, 4
Do not
write
outside the
*02*
.1
0 2
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.
[2 marks]
for more: tyrionpapers.com
IB/M/Jun25/7408/3BA
7408/3BA
ACTUAL 2025
PAPER MERGED
WITH MARK
SCHEME
Paper 3
Section B Astrophysics
Please write clearly in block capitals.
Candidate number
Centre number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
A-level PHYSICS
Paper 3
Section B Astrophysics
Tuesday 17 June 2025 Morning Time allowed: The total time for
both sections of this paper is 2
Materials hours. You are advised to spend
For this paper you must have:
• a pencil and a ruler approximately
• a scientific calculator 50 minutes on this section.
• a Data and Formulae Booklet • a protractor.
for more: tyrionpapers.com
, 2
Do not
write
outside the
Instructions For Examiner’s Use
• Use black ink or black ball-point pen.
• Fill in the boxes at the top of this page. Question Mark
• Answer all questions.
1
• You must answer the questions in the spaces provided. Do not write 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 to be 4
marked. 5
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.
*JUN2574083BA01*
IB/M/Jun25/G4006/E7
7408/3BA
• Show all your working.
for more: tyrionpapers.com
IB/M/Jun25/7408/3BA
, 3
Do not
Section B write
outside the
box
0 1 Answer all questions in this section. box
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.
.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
.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.
0[1 mark]
1
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]
Turn over ►
5
for more: tyrionpapers.com
IB/M/Jun25/7408/3BA
, 4
Do not
write
outside the
*02*
.1
0 2
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.
[2 marks]
for more: tyrionpapers.com
IB/M/Jun25/7408/3BA
