2025 AQA AS PHYSICS Paper 1 Question Paper & Mark Scheme (Merged)
Wednesday 14 May 2025 [VERIFIED]
Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
AS
PHYSICS
Paper 1
Wednesday 14 May 2025 Morning Time allowed: 1 hour 30 minutes
Materials
For this paper you must have: For Examiner’s Use
a pencil and a ruler
Question Mark
a scientific calculator
a Data and Formulae Booklet 1
a protractor. 2
3
Instructions
Use black ink or black ball-point pen. 4
Fill in the boxes at the top of this page. 5
Answer all questions. 6
You must answer the questions in the spaces provided. Do not write
7
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 TOTAL
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 70.
You are expected to use a scientific calculator where appropriate.
A Data and Formulae Booklet is provided as a loose insert.
7407/1
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IB/M/Jun25/G4003/V3
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 Hydrogen has three naturally occurring isotopes. One of these isotopes is
hydrogen-3 13H .
0 1 . 1 Calculate the specific charge of a nucleus of hydrogen-3.
[2 marks]
specific charge = ________________________ C kg−1
0 1 . 2 The specific charge of the hydrogen-3 nucleus is less than the specific charges of the
nuclei of the other two isotopes.
Suggest why.
[2 marks]
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, 3
Do not write
outside the
Kaons (K) and pions (π) are produced when a beam of antiprotons is incident on a box
sample of hydrogen gas.
One reaction that occurs is
p p K π K0
0 1 . 3 Deduce, with reference to appropriate conservation laws, the quark structure of the
K0 produced in this reaction.
[3 marks]
quark structure =
0 1 . 4 One possible decay of a π+ particle is
π+ A + B
where A is a charged lepton.
Suggest, with reference to appropriate conservation laws, the name of A and the
name of B.
[2 marks]
name of A
name of B 9
Turn over ►
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, 4
Do not write
outside the
box
0 2 An optical fibre consists of a glass core surrounded by cladding.
Monochromatic light enters the glass core of the optical fibre from air.
0 2 . 1 What happens to the frequency of the light as it enters the glass core?
Tick () one box.
[1 mark]
It decreases.
It is unchanged.
It increases.
The refractive index of the glass core is 1.51
0 2 . 2 The critical angle at the core–cladding boundary is 80.7°
Calculate the refractive index of the cladding.
[2 marks]
refractive index of cladding =
tyrionpapers.com
IB/M/Jun25/7407/1
Wednesday 14 May 2025 [VERIFIED]
Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
AS
PHYSICS
Paper 1
Wednesday 14 May 2025 Morning Time allowed: 1 hour 30 minutes
Materials
For this paper you must have: For Examiner’s Use
a pencil and a ruler
Question Mark
a scientific calculator
a Data and Formulae Booklet 1
a protractor. 2
3
Instructions
Use black ink or black ball-point pen. 4
Fill in the boxes at the top of this page. 5
Answer all questions. 6
You must answer the questions in the spaces provided. Do not write
7
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 TOTAL
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 70.
You are expected to use a scientific calculator where appropriate.
A Data and Formulae Booklet is provided as a loose insert.
7407/1
tyrionpapers.com
IB/M/Jun25/G4003/V3
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 Hydrogen has three naturally occurring isotopes. One of these isotopes is
hydrogen-3 13H .
0 1 . 1 Calculate the specific charge of a nucleus of hydrogen-3.
[2 marks]
specific charge = ________________________ C kg−1
0 1 . 2 The specific charge of the hydrogen-3 nucleus is less than the specific charges of the
nuclei of the other two isotopes.
Suggest why.
[2 marks]
tyrionpapers.com
IB/M/Jun25/7407/1
, 3
Do not write
outside the
Kaons (K) and pions (π) are produced when a beam of antiprotons is incident on a box
sample of hydrogen gas.
One reaction that occurs is
p p K π K0
0 1 . 3 Deduce, with reference to appropriate conservation laws, the quark structure of the
K0 produced in this reaction.
[3 marks]
quark structure =
0 1 . 4 One possible decay of a π+ particle is
π+ A + B
where A is a charged lepton.
Suggest, with reference to appropriate conservation laws, the name of A and the
name of B.
[2 marks]
name of A
name of B 9
Turn over ►
tyrionpapers.com
IB/M/Jun25/7407/1
, 4
Do not write
outside the
box
0 2 An optical fibre consists of a glass core surrounded by cladding.
Monochromatic light enters the glass core of the optical fibre from air.
0 2 . 1 What happens to the frequency of the light as it enters the glass core?
Tick () one box.
[1 mark]
It decreases.
It is unchanged.
It increases.
The refractive index of the glass core is 1.51
0 2 . 2 The critical angle at the core–cladding boundary is 80.7°
Calculate the refractive index of the cladding.
[2 marks]
refractive index of cladding =
tyrionpapers.com
IB/M/Jun25/7407/1
