AQA A-Level Physics Paper 1 7408/1 | Marking Scheme 2025

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I declare this is my own work.
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A-level
PHYSICS
Paper1 b




Friday 23 May 2025 b b b Morning Time allowed: 2 hours
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Materials
For this paper you must have:
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For Examiner’s Use
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 a pencil and a ruler
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Question Mark
 a scientific calculator
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 a Data and Formulae Booklet
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 a protractor.
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Instructions
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 Use black ink or black ball-point pen.
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 Fill in the boxes at the top of this page.
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 Answer all questions. b b 6
 You must answer the questions in the spaces provided. Do not write outsi
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de the box around each page or on blank pages.
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 If you need extra space for your answer(s), use the lined pages at the end of this b
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ook. Write the question number against your answer(s).
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9–33
 Do all rough work in this book. Cross through any work you do not want to be
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TOTAL
marked.
 Show all your working. b b b




Information
 The marks for questions are shown in brackets.
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 The maximum mark for this paper is 85.
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 You are expected to use a scientific calculator where appropriate.
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 A Data and Formulae Booklet is provided as a loose insert.
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IB/M/Jun25/G4006/E14 7408/1

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outside theb


Section A b box


Answer all questions in this section.
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0 1 This question is about an isotope of titanium that only decays by electron capture.
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0 1 . 1 Complete Figure 1 to show the quark change that occurs during electron capture. Label th
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e incoming and outgoing particles and the exchange particle.
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[3 marks] b




Figure 1 b




0 1 . 2 In some circumstances, a nucleus of this isotope can exist with no orbiting electrons.
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Explain why a neutral atom of this isotope is less stable than a nucleus that has no orbiting e
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lectrons.
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IB/M/Jun25/7408/1

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0 1 . 3 box
A nucleus of this isotope of titanium has a proton number of 22 and a specific charge of 4.8
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× 107 C kg−1.
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Determine the number of neutrons in this nucleus.
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[2 marks]
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number of neutrons =b b b b
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Turn over for the next question
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box
0 2 . 1 State what is meant by a transverse wave.
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[2 marks]
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Figure 2 shows apparatus that is used to investigate stationary waves on a stretched wir
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e.

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A block of weight W is used to keep the wire under tension.
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The frequency of the ac supply is varied until a stationary wave is produced on the wire.
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0 2 . 2 Explain how a stationary wave is produced on the wire.
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[1 mark]
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IB/M/Jun25/7408/1