Physics > QUESTIONS & ANSWERS > AQA A-level PHYSICS 7408/3A Paper 3 Section A Question Paper + Mark scheme (Merged) Grade A+ (All)

AQA A-level PHYSICS 7408/3A Paper 3 Section A Question Paper + Mark scheme (Merged) Grade A+

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AQA A-level PHYSICS 7408/3A Paper 3 Section A Question Paper + Mark scheme (Merged) June 2021 Version: 1.0 Final *JUN2174083A01* IB/M/Jun21/E8 7408/3A For Examiner’s Use Question Mark 1 2 3 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 45. •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 A Time allowed: The total time for both sections of this paper is 2 hours. You are advised to spend approximately 70 minutes on this section. 2 *02* IB/M/Jun21/7408/3A Do not write outside the box Section A Answer all questions in this section. 0 1 Figure 1 shows apparatus used to investigate the inverse-square law for gamma radiation. Figure 1 3 *03* Turn over ► IB/M/Jun21/7408/3A Do not write outside the box A sealed source that emits gamma radiation is held in a socket attached to clamp B. The vertical distance between the open end of the source and the bench is 138 mm. A radiation detector, positioned vertically above the source, is attached to clamp T. A student is told not to move the stands closer together. 0 1 . 1 Describe a procedure for the student to find the value of d, the vertical distance between the open end of the source and the radiation detector. In your answer, annotate Figure 1 to show how a set-square can be used in this procedure. [2 marks] Question 1 continues on the next page 4 *04* IB/M/Jun21/7408/3A Do not write outside the box 0 1 . 2 Before the source was brought into the room, a background count Cb was recorded. Cb = 630 counts in 15 minutes With the source and detector in the positions shown in Figure 1, d = 530 mm. Separate counts C1, C2 and C3 are recorded. C1 = 90 counts in 100 s C2 = 117 counts in 100 s C3 = 102 counts in 100 s RC is the mean count rate corrected for background radiation. Show that when d = 530 mm, RC is about 0.3 s−1. [2 marks]

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