Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
A-level
PHYSICS
Paper 3 For Examiner’s Use
Section B Astrophysics Question Mark
1
2
3
4
5
TOTAL
Time allowed: The total
Materials time for both sections
For this paper you must have: of this paper is 2
• a pencil and a ruler
hours. You are advised
• a scientific calculator
to spend approximately
50 minutes on this
section.
• a Data and Formulae Booklet
• a protractor.
Instructions
• Use black ink or black ball-point pen.
• Fill in the boxes at the top of this page.
• Answer all questions.
• You must answer the questions in the spaces provided. Do not write outside the box around each
page or on blank pages.
A-level PHYSICS Paper 3 Section B Astrophysics
, 2
Do not write
outside the
box
• 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.
*JUN2174083ba01*
0 1 IB/M/Jun21/E8 7408/3BA
Section B
Answer all questions in this section.
0 1
Figure 1
shows the evolution of a star similar to the Sun on a Hertzsprung-Russell (HR)
diagram.
A-level PHYSICS Paper 3 Section B Astrophysics
0 1
, 3
Do not write
outside the
box
Figure 1
.1 State the evolutionary stage of the star at each of the points W, X, Y and Z.
[3 marks]
W
X
Y
Z
Theta Carinae is a star with a radius five times that of the Sun. It has a surface
temperature of 31 000 K.
.2 Annotate Figure 1 with a T to show the position of Theta Carinae.
[1 mark]
*02*
An astronomer suggests that an Earth-sized planet orbits Theta Carinae.
0 1 11
.3
Explain one difficulty with using the transit method to detect this planet.
Turn over ►
A-level PHYSICS Paper 3 Section B Astrophysics
, 4
Do not write
outside the
box
0 1
.4
The astronomer suggests that the Earth-sized planet receives a similar amount of
power from Theta Carinae as the Earth does from the Sun.
The average power output of the Sun is
Determine the orbital radius of the Earth-sized planet orbiting Theta Carinae.
*03*
A-level PHYSICS Paper 3 Section B Astrophysics
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
A-level
PHYSICS
Paper 3 For Examiner’s Use
Section B Astrophysics Question Mark
1
2
3
4
5
TOTAL
Time allowed: The total
Materials time for both sections
For this paper you must have: of this paper is 2
• a pencil and a ruler
hours. You are advised
• a scientific calculator
to spend approximately
50 minutes on this
section.
• a Data and Formulae Booklet
• a protractor.
Instructions
• Use black ink or black ball-point pen.
• Fill in the boxes at the top of this page.
• Answer all questions.
• You must answer the questions in the spaces provided. Do not write outside the box around each
page or on blank pages.
A-level PHYSICS Paper 3 Section B Astrophysics
, 2
Do not write
outside the
box
• 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.
*JUN2174083ba01*
0 1 IB/M/Jun21/E8 7408/3BA
Section B
Answer all questions in this section.
0 1
Figure 1
shows the evolution of a star similar to the Sun on a Hertzsprung-Russell (HR)
diagram.
A-level PHYSICS Paper 3 Section B Astrophysics
0 1
, 3
Do not write
outside the
box
Figure 1
.1 State the evolutionary stage of the star at each of the points W, X, Y and Z.
[3 marks]
W
X
Y
Z
Theta Carinae is a star with a radius five times that of the Sun. It has a surface
temperature of 31 000 K.
.2 Annotate Figure 1 with a T to show the position of Theta Carinae.
[1 mark]
*02*
An astronomer suggests that an Earth-sized planet orbits Theta Carinae.
0 1 11
.3
Explain one difficulty with using the transit method to detect this planet.
Turn over ►
A-level PHYSICS Paper 3 Section B Astrophysics
, 4
Do not write
outside the
box
0 1
.4
The astronomer suggests that the Earth-sized planet receives a similar amount of
power from Theta Carinae as the Earth does from the Sun.
The average power output of the Sun is
Determine the orbital radius of the Earth-sized planet orbiting Theta Carinae.
*03*
A-level PHYSICS Paper 3 Section B Astrophysics
