2023 AQA A-level PHYSICS 7408/3BD Paper 3 Section B Turning points in physics Question Paper & Mark scheme (Merged) June 2023 [VERIFIED]

2023 AQA A-level PHYSICS 7408/3BD Paper 3 Section B Turning points in physics Question Paper & Mark scheme (Merged) June 2023 [VERIFIED] A-level PHYSICS Paper 3 Section B Turning points in physics Thursday 15 June 2023 Morning Time allowed: The total time for Materials both sections of this paper is For this paper you must have: 2 hours. You are advised to • a pencil and a ruler spend approximately • a scientific calculator 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. • 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. For Examiner’s Use Question Mark 1 2 3 4 TOTAL 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. *JUN2374083BD01* IB/M/Jun23/E8 7408/3BD 2 Section B Answer all questions in this section. 0 1In Figure 1, a beam of electrons travels through the aperture in the anode and hits the screen. Figure 1 0 1 . 1Explain how the electrons that form the beam are emitted. [1 mark] 0 1 . 2Show that the maximum speed of the electrons in the beam is about 1.3 × 107 m s −1 . [1 mark] Do Do not not write outside the box *02* IB/M/Jun23/7408/3BD 3 0 1 . 3 A student suggests that the apparatus can be used to demonstrate the wave properties of electrons in the beam, provided that the aperture in the anode has a suitable diameter. Discuss whether the student is correct. Support your answer with a calculation. [3 marks] Question 1 continues on the next page Turn over ► *03* Do not write outside the box IB/M/Jun23/7408/3BD 4 0 1 . 4 In 1897, J J Thomson determined a value for the specific charge of an unknown particle. The unknown particle is now known to be the electron. Describe one method to determine the specific charge of the electron. Your answer should include: • a description of the apparatus used and the measurements made • a description of how the specific charge can be determined using these measurements • an explanation of the conclusion made by Thomson from the value that he determined.