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 1
Friday 23 May 2025 Morning Time allowed: 2 hours
Materials
For this paper you must have: For Examiner’s Use
• a pencil and a ruler Question Mark
• a scientific calculator
1
• a Data and Formulae Booklet
• a protractor. 2
3
Instructions
4
• Use black ink or black ball-point pen.
• 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.
8
• 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). 9–33
• Do all rough work in this book. Cross through any work you do not want
TOTAL
to be marked.
• Show all your working.
Information
• The marks for questions are shown in brackets.
• The maximum mark for this paper is 85.
• You are expected to use a scientific calculator where appropriate.
• A Data and Formulae Booklet is provided as a loose insert.
*JUN257408101*
IB/M/Jun25/G4006/E14 7408/1
, 2
Do not write
outside the
Section A box
Answer all questions in this section.
0 1 This question is about an isotope of titanium that only decays by electron capture.
0 1 . 1 Complete Figure 1 to show the quark change that occurs during electron capture.
Label the incoming and outgoing particles and the exchange particle.
[3 marks]
Figure 1
0 1 . 2 In some circumstances, a nucleus of this isotope can exist with no orbiting electrons.
Explain why a neutral atom of this isotope is less stable than a nucleus that has no
orbiting electrons.
[1 mark]
*02*
IB/M/Jun25/7408/1
, 3
Do not write
outside the
0 1 . 3 A nucleus of this isotope of titanium has a proton number of 22 and a specific charge box
of 4.8 × 107 C kg−1.
Determine the number of neutrons in this nucleus.
[2 marks]
number of neutrons = 6
Turn over for the next question
Turn over ►
*03*
IB/M/Jun25/7408/1
, 4
Do not write
outside the
0 2 . 1 State what is meant by a transverse wave. box
[2 marks]
Figure 2 shows apparatus that is used to investigate stationary waves on a
stretched wire.
Figure 2
A block of weight W is used to keep the wire under tension.
The frequency of the ac supply is varied until a stationary wave is produced on
the wire.
0 2 . 2 Explain how a stationary wave is produced on the wire.
[1 mark]
*04*
IB/M/Jun25/7408/1
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
A-level
PHYSICS
Paper 1
Friday 23 May 2025 Morning Time allowed: 2 hours
Materials
For this paper you must have: For Examiner’s Use
• a pencil and a ruler Question Mark
• a scientific calculator
1
• a Data and Formulae Booklet
• a protractor. 2
3
Instructions
4
• Use black ink or black ball-point pen.
• 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.
8
• 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). 9–33
• Do all rough work in this book. Cross through any work you do not want
TOTAL
to be marked.
• Show all your working.
Information
• The marks for questions are shown in brackets.
• The maximum mark for this paper is 85.
• You are expected to use a scientific calculator where appropriate.
• A Data and Formulae Booklet is provided as a loose insert.
*JUN257408101*
IB/M/Jun25/G4006/E14 7408/1
, 2
Do not write
outside the
Section A box
Answer all questions in this section.
0 1 This question is about an isotope of titanium that only decays by electron capture.
0 1 . 1 Complete Figure 1 to show the quark change that occurs during electron capture.
Label the incoming and outgoing particles and the exchange particle.
[3 marks]
Figure 1
0 1 . 2 In some circumstances, a nucleus of this isotope can exist with no orbiting electrons.
Explain why a neutral atom of this isotope is less stable than a nucleus that has no
orbiting electrons.
[1 mark]
*02*
IB/M/Jun25/7408/1
, 3
Do not write
outside the
0 1 . 3 A nucleus of this isotope of titanium has a proton number of 22 and a specific charge box
of 4.8 × 107 C kg−1.
Determine the number of neutrons in this nucleus.
[2 marks]
number of neutrons = 6
Turn over for the next question
Turn over ►
*03*
IB/M/Jun25/7408/1
, 4
Do not write
outside the
0 2 . 1 State what is meant by a transverse wave. box
[2 marks]
Figure 2 shows apparatus that is used to investigate stationary waves on a
stretched wire.
Figure 2
A block of weight W is used to keep the wire under tension.
The frequency of the ac supply is varied until a stationary wave is produced on
the wire.
0 2 . 2 Explain how a stationary wave is produced on the wire.
[1 mark]
*04*
IB/M/Jun25/7408/1
