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AQA-7408-3BA-PHYSICS FINAL MARK SCHEME PAPER 3BA-SECTION B;ASTROPHYSICS-A LEVEL-Jun24-v1.0.

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AQA-7408-3BA-PHYSICS FINAL MARK SCHEME PAPER 3BA-SECTION B-A LEVEL-Jun24-v1.0. Question Answers Additional comments/Guidance Mark AO 01.1 Determination of focal length of objective OR adds their fo and fe  1.67 (m) CAO  fo = M × fe = 75 × 0.022 = 1.65 (m) No sf penalty Condone 2 sf 1.7 2 AO2 Question Answers Additional comments/Guidance Mark AO 01.2 Determination of angle subtended by Jupiter at unaided eye OR uses: distance to Jupiter = diameter of Jupiter ÷ angle subtended with their diameter OR their angle  distance = 6.2 × 108 (km)  CAO E.g. 1.7 × 10–2 / 75 = 2.3 × 10–4 (rad) 2 × 7.0 × 104 /2.3 × 10–4 In MP1 allow use of trig and angle in degrees or radians. Condone use of 1.7 × 10–2 degrees. Do not award MP1 if both angle and diameter are incorrect. 2 AO2 000006 Page 6 of 13 PHYSICS MARK SCHEME – A-LEVEL PHYSICS – 7408/3BA – JUNE 2024 7 Question Answers Additional comments/Guidance Mark AO 01.3 Idea that chromatic aberration is caused by dispersion of light passing through lens OR different colours/wavelengths being refracted by different amounts/to different focal points.  Idea that effect is greatest at greatest curvature/edge of lens OR least at centre of lens OR Idea that light can only travel through part of lens with little curvature  therefore chromatic aberration is reduced.  Marks can be given for labelled diagram. Credit answers that suggest edges of lens act like a triangular prism. MP3 is contingent on MP2. 3 1 × AO1 2 × AO3

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AQA
MARK SCHEME AQA




A-level
PHYSICS
7408/3BA
Paper 3 Section B Astrophysics
Mark scheme




S
June 2024
Version: 1.0 Final IC
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PH




Page 1 of 13

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MARK SCHEME – A-LEVEL PHYSICS – 7408/3BA – JUNE 2024



Mark schemes are prepared by the Lead Assessment Writer and considered, together with the relevant
questions, by a panel of subject teachers. This mark scheme includes any amendments made at the
standardisation events which all associates participate in and is the scheme which was used by them in
this examination. The standardisation process ensures that the mark scheme covers the students’
responses to questions and that every associate understands and applies it in the same correct way.
As preparation for standardisation each associate analyses a number of students’ scripts. Alternative
answers not already covered by the mark scheme are discussed and legislated for. If, after the
standardisation process, associates encounter unusual answers which have not been raised they are
required to refer these to the Lead Examiner.

It must be stressed that a mark scheme is a working document, in many cases further developed and
expanded on the basis of students’ reactions to a particular paper. Assumptions about future mark
schemes on the basis of one year’s document should be avoided; whilst the guiding principles of
assessment remain constant, details will change, depending on the content of a particular examination
paper.

No student should be disadvantaged on the basis of their gender identity and/or how they refer to the
gender identity of others in their exam responses.




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A consistent use of ‘they/them’ as a singular and pronouns beyond ‘she/her’ or ‘he/him’ will be credited in
exam responses in line with existing mark scheme criteria.
IC
Further copies of this mark scheme are available from aqa.org.uk
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PH




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