AQA A-LEVEL PHYSICS Paper 3 7408/3BA Astrophysics|| QUESTIONS & MARKING SCHEME MERGED|

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/Jun23/7408/3BA Do not write outside the Section B box Answer all questions in this section. 0 1 . 1 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 0 1 . 2 State the spectral class of Rigel. [1 mark] 3 *03* Turn over ► IB/M/Jun23/7408/3BA Do not write outside the 0 1 box . 3 The apparent magnitude of Rigel is 0.11 Calculate, in pc, the distance from Rigel to the Earth. [2 marks] distance = pc Question 1 continues on the next page 4 *04* IB/M/Jun23/7408/3BA Do not write outside the 0 1 box . 4 Figure 1 shows a Hertzsprung–Russell (HR) diagram. Figure 1 Draw a line on Figure 1 to show the evolution of the Sun from formation to white dwarf. [1 mark] 0 1 . 5 One stage in the evolution of Rigel includes the emission of a gamma ray burst. Outline the circumstances during which a gamma ray burst will be emitted by Rigel. [2 marks] 7 5 *05* Turn over ► IB/M/Jun23/7408/3BA Do not write outside the Turn over for the next question box DO NOT WRITE ON THIS PAGE ANSWER IN THE SPACES PROVIDED 6 *06* IB/M/Jun23/7408/3BA Do not write outside the 0 2 box . 1 State what is meant by normal adjustment when applied to an astronomical refracting telescope. [1 mark] 0 2 . 2 Which combination of lenses gives the largest angular magnification when used as an astronomical telescope in normal adjustment? Tick () one box. [1 mark] Objective lens Eyepiece lens Focal length / cm Type Focal length / cm Type 5 diverging 100 c