Physics > QUESTION PAPER & MARK SCHEME > AQA A-level PHYSICS 7408/3BD Paper 3 Section B Turning points in physics Question Paper + Mark schem (All)

AQA A-level PHYSICS 7408/3BD Paper 3 Section B Turning points in physics Question Paper + Mark scheme (Merged) GRADE A+

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AQA A-level PHYSICS 7408/3BD Paper 3 Section B Turning points in physics Question Paper + Mark scheme (Merged) June 2021 Version: 1.0 Final *JUN2174083BD01* IB/M/Jun21/E6 7408/3BD For Examine... r’s Use Question Mark 1 2 3 4 TOTAL Materials For this paper you must have: •a pencil and a ruler •a scientific calculator •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. 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. 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 3 Section B Turning points in physics Time allowed: The total time for both sections of this paper is 2 hours. You are advised to spend approximately 50 minutes on this section. 2 *02* IB/M/Jun21/7408/3BD Do not write outside the box Section B Answer all questions in this section. 0 1 Figure 1 shows the apparatus used in an experiment to investigate electron diffraction and the de Broglie hypothesis. Figure 1 0 1 . 1 Explain how high-speed electrons are produced in the apparatus in Figure 1. In your answer you should: • name parts A and B • discuss the purposes of potential differences V1 and V2. [4 marks] Do not write outside the box 3 *03* Turn over ► IB/M/Jun21/7408/3BD Do not write outside the box 0 1 . 2 In the experiment, electrons are incident on a target made of a crystalline material. The electron wavelengths need to be about 50% the size of an atom to produce a diffraction pattern on the screen. Suggest a suitable value for V2. Support your answer with a calculation. [4 marks] [Show More]

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