A-level PHYSICS Paper 3 Section B Astrophysics

A-level PHYSICS Paper 3 Section B Astrophysics Thursday 15 June 2023 Morning 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. 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. • 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. *JUN237403a01* 7408/3BA Section B Answer all questions in this section. outside the box . Draw a labelled diagram to define the parsec (pc). [1 mark] Table 1 shows data for two stars: Rigel and the Sun. Table 1 Star Surface temperature / K Absolute magnitude Mass / kg Rigel 12 000 −7.84 3.6 × 1031 Sun 5700 4.83 2.0 × 1030 . State the spectral class of Rigel. [1 mark] . The apparent magnitude of Rigel is 0.11 Calculate, in pc, the distance from Rigel to the Earth. [2 marks] box