Physics > QUESTIONS & ANSWERS > AQA A-level PHYSICS 7408/1 Paper 1 Question Paper + Mark scheme (Merged) Grade A+ (All)

AQA A-level PHYSICS 7408/1 Paper 1 Question Paper + Mark scheme (Merged) Grade A+

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AQA A-level PHYSICS 7408/1 Paper 1 Question Paper + Mark scheme (Merged) June 2021 Version: 1.0 Final *JUN217408101* IB/M/Jun21/E8 7408/1 For Examiner’s Use Question Mark 1 2 3 4 5 6 7–31 TOTAL Time allowed: 2 hours 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 85. • 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 1 2 *02* IB/M/Jun21/7408/1 Section A Answer all questions in this section. 0 1 Cosmic rays are high-energy particles that come from space. Most of these particles are protons. There are other particles in cosmic rays, including atomic nuclei. Table 1 gives the data for one particular nucleus X. Table 1 Mass / kg 8.02 × 10−26 Specific charge / C kg−1 4.39 × 107 Kinetic energy / MeV 215 0 1 . 1 Determine the number of neutrons in nucleus X. [3 marks] number of neutrons = 0 1 . 2 Calculate the speed of X. Ignore relativistic effects. [3 marks] speed = m s−1 Do not write outside the box 3 *03* Turn over ► IB/M/Jun21/7408/1 Do not write outside the box A pion (π+) and a kaon (K+) are produced when cosmic rays interact with the upper atmosphere. 0 1 . 3 The π+ decays to produce a positron and an electron neutrino. Show how the conservation laws apply to this decay. [2 marks] 0 1 . 4 The K+ decays to produce an anti-muon and a muon neutrino. Explain how strangeness applies in this decay. [2 marks] 0 1 . 5 Write an equation for a K+ decay that involves only hadrons. [2 marks] 12 4 *04* IB/M/Jun21/7408/1 Do not write outside the box 0 2 Figure 1 shows apparatus used to investigate the properties of microwaves. The microwaves from the transmitter T are vertically polarised and have a wavelength of about 3 cm. The microwaves are detected at the receiver by a vertical metal rod R. Figure 1 0 2 . 1 Explain how the apparatus can be used to demonstrate that the waves from T are vertically polarised. [3 marks] 5 *05* Turn over ► IB/M/Jun21/7408/1 Do not write outside the box Figures 2a and 2b show T and R and two different positions of a metal plate M that reflects microwaves. M is vertical and parallel to the direct transmission from T to R. Figure 2a Figure 2b In an experiment, T and R are about two metres apart. M is moved slowly towards X. Figure 2a shows the initial position of M. Figure 2b shows M when it has been moved a few centimetres. The arrowed lines show the path of waves that reach R directly and the path of waves that reach R by reflection from M. 0 2 . 2 Explain what happens to the signal detected by R as M is moved slowly towards X. [4 marks]

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