A-level PHYSICS
7408/3BD ACTUAL 2025
PAPER MERGED WITH
MARK SCHEMEE
Paper 3
Section B Turning points in physics
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 Turning points in physics For Examiner’s Use
Question Mark
Tuesday 17 June 2025 Morning Time allowed: The total
1 time for
both sections of this 2paper is 2
Materials hours. You are advised3 to spend
For this paper you must have:
• a pencil and a ruler approximately 4
• a scientific calculator 50 minutes on this section.
TOTAL
• 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.
for more: tyrionpapers.com
, 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).
• 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.
*JUN2574083BD01*
IB/M/Jun25/G4006/E7
7408/3BD
• Do all rough work in this book. Cross through any work you do not want to
be marked.
Section B
Answer all questions in this section.
This question is about Thomson’s determination of the electron’s specific charge.
0 1
You should not use the values of the electron charge, mass or specific charge from
the data and formulae booklet in this question.
Figure 1 shows part of the apparatus that Thomson used to measure the specific
charge of the electron.
Figure 1
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IB/M/Jun25/7408/3BD
, 3
Do not
write
outside the
box
.1
0 1
A modern version of Thomson’s apparatus uses thermionic emission in the production
of the electron beam.
Suggest how the electron beam is produced in this modern version.
You should include a labelled diagram and suitable values for the power supplies
used.
[3 marks]
*02*
Turn over ►
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IB/M/Jun25/7408/3BD
, 4
Do not
write
outside the
box
Question 1 continues on the next page
for more: tyrionpapers.com
IB/M/Jun25/7408/3BD
7408/3BD ACTUAL 2025
PAPER MERGED WITH
MARK SCHEMEE
Paper 3
Section B Turning points in physics
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 Turning points in physics For Examiner’s Use
Question Mark
Tuesday 17 June 2025 Morning Time allowed: The total
1 time for
both sections of this 2paper is 2
Materials hours. You are advised3 to spend
For this paper you must have:
• a pencil and a ruler approximately 4
• a scientific calculator 50 minutes on this section.
TOTAL
• 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.
for more: tyrionpapers.com
, 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).
• 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.
*JUN2574083BD01*
IB/M/Jun25/G4006/E7
7408/3BD
• Do all rough work in this book. Cross through any work you do not want to
be marked.
Section B
Answer all questions in this section.
This question is about Thomson’s determination of the electron’s specific charge.
0 1
You should not use the values of the electron charge, mass or specific charge from
the data and formulae booklet in this question.
Figure 1 shows part of the apparatus that Thomson used to measure the specific
charge of the electron.
Figure 1
for more: tyrionpapers.com
IB/M/Jun25/7408/3BD
, 3
Do not
write
outside the
box
.1
0 1
A modern version of Thomson’s apparatus uses thermionic emission in the production
of the electron beam.
Suggest how the electron beam is produced in this modern version.
You should include a labelled diagram and suitable values for the power supplies
used.
[3 marks]
*02*
Turn over ►
for more: tyrionpapers.com
IB/M/Jun25/7408/3BD
, 4
Do not
write
outside the
box
Question 1 continues on the next page
for more: tyrionpapers.com
IB/M/Jun25/7408/3BD
