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

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AQA A-level PHYSICS 7408/3BA Paper 3 Section B Astrophysics Question Paper + Mark scheme (Merged) June 2021 Version: 1.0 Final *JUN2174083ba01* IB/M/Jun21/E8 7408/3BA For Examiner’s Use Question Mark 1 2 3 4 5 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 Astrophysics 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/Jun21/7408/3BA Do not write outside the box Section B Answer all questions in this section. 0 1 Figure 1 shows the evolution of a star similar to the Sun on a Hertzsprung-Russell (HR) diagram. Figure 1 0 1 . 1 State the evolutionary stage of the star at each of the points W, X, Y and Z. [3 marks] W X Y Z Theta Carinae is a star with a radius five times that of the Sun. It has a surface temperature of 31 000 K. 0 1 . 2 Annotate Figure 1 with a T to show the position of Theta Carinae. [1 mark] 3 *03* Turn over ► IB/M/Jun21/7408/3BA Do not write outside the box An astronomer suggests that an Earth-sized planet orbits Theta Carinae. 0 1 . 3 Explain one difficulty with using the transit method to detect this planet. [2 marks] 0 1 . 4 The astronomer suggests that the Earth-sized planet receives a similar amount of power from Theta Carinae as the Earth does from the Sun. The average power output of the Sun is 3.8 × 1026 W. Determine the orbital radius of the Earth-sized planet orbiting Theta Carinae. [5 marks] orbital radius = m 11 4 *04* IB/M/Jun21/7408/3BA Do not write outside the box 0 2 . 1 Which graph shows the light curve for a typical type 1a supernova? Tick () one box. [1 mark] A B C D A B C D 5 *05* Turn over ► IB/M/Jun21/7408/3BA Do not write outside the box 0 2 . 2 The Andromeda galaxy is approximately 7.7 × 105 pc from Earth. Deduce whether a type 1a supernova which occurred in Andromeda can be observed from Earth with the naked eye. [3 marks]

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