Physics > QUESTIONS & ANSWERS > AQA AS PHYSICS 7407/1 Paper 1 Question Paper + Mark scheme (Merged) GRADE A+ (All)

AQA AS PHYSICS 7407/1 Paper 1 Question Paper + Mark scheme (Merged) GRADE A+

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AQA AS PHYSICS 7407/1 Paper 1 Question Paper + Mark scheme (Merged) June 2021 Version: 1.0 Final *jun217407101* IB/M/Jun21/E7 7407/1 For Examiner’s Use Question Mark 1 2 3 4 5 6 7 TOTAL Time allowed: 1 hour 30 minutes 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 70. • 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. AS PHYSICS Paper 1 2 *02* IB/M/Jun21/7407/1 Answer all questions in the spaces provided. 0 1 . 1 Identify the number of neutrons in a nucleus of polonium-210 ()210Po 84. Tick () one box. [1 mark] 84 126 210 294 0 1 . 2 A polonium-210 nucleus is formed when a stationary nucleus of bismuth-210 decays. A beta-minus (β−) particle is emitted in this decay. Outline, with reference to β− decay, why bismuth-210 and polonium-210 have different proton numbers. [2 marks] Do not write outside the box 3 *03* Turn over ► IB/M/Jun21/7407/1 Do not write outside the box The kinetic energies of β− particles emitted from a sample of bismuth-210 are analysed. These β− particles have a range of kinetic energies. The total energy released when each nucleus of bismuth-210 decays to a nucleus of polonium-210 is 1.2 MeV. Figure 1 shows the variation with Ek of the number of β− particles that have the kinetic energy Ek. Figure 1 0 1 . 3 Explain how the data in Figure 1 support the hypothesis that a third particle is produced during β− decay. [2 marks] Question 1 continues on the next page 4 *04* IB/M/Jun21/7407/1 Do not write outside the box 0 1 . 4 This third particle is an electron antineutrino. Explain why an electron antineutrino, rather than an electron neutrino, is produced during β− decay. [2 marks] 0 1 . 5 A large tank of water is used as part of an electron antineutrino detector. An electron antineutrino ν?e enters the tank and interacts with a proton (p). Figure 2 represents this interaction. Figure 2 Identify X and Y. [2 marks] X = Y = 5 *05* Turn over ► IB/M/Jun21/7407/1 Do not write outside the box 0 1 . 6 The positron produced in the interaction in Figure 2 slows down and collides with a lepton in a molecule of water. Describe the process that occurs when the positron collides with this lepton. In your answer you should identify the lepton in the molecule of water. [3 marks] 0 1 . 7 The range of the electromagnetic interaction is infinite. Table 1 gives the range of the strong nuclear interaction and the range of the weak nuclear interaction. Table 1 Interaction Range / m strong nuclear 10−15 weak nuclear 10−18 Deduce whether the positron or the electron antineutrino is likely to travel the shorter distance in the tank of water before interacting. [3 marks]

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