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AQA-7408-3BB-PHYSICS FINAL MARK SCHEME PAPER 3BB-SECTION B:Medical physics-A LEVEL-Jun24-v1.0

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AQA-7408-3BB-PHYSICS FINAL MARK SCHEME PAPER 3BB-SECTION B:Medical physics-A LEVEL-Jun24-v1.0. Question Answers Additional comments/Guidelines Mark AO 01.1 myopia  Allow short sightedness 1 AO2 Question Answers Additional comments/Guidelines Mark AO 01.2 Max one from  • Evidence of with u = ∞ and v =-6 a • Correct use of a power equationb 1 P = = 0.17(D) f −        b 1 끫뢦 = 1 끫룄 + 1 끫룆 with: • u = ∞, v = (-)6 • u = ∞, v = 0.02 • u = 6, v = 0.02 Where u = ∞, condone missing 1 끫룄 Allow 1 (−)6 + � 1 ∞ � if u and v not defined Correct answer  Max 1 mark for correct answer where clear statement that v = ∞ and u =-6 ECF for hypermetropia/ long sightedness on 01.1 1 끫뢦 = 1 0.25 + 1 (−)6  = 3.83  (D) 2 AO2 Question Answers Additional comments/Guidelines Mark AO 01.3 spherical cylinder axis  1 AO1 Total 4 000006 Page 6 of 14 PHYSICS MARK SCHEME – A-LEVEL PHYSICS – 7408/3BB – JUNE 2024 7 Question Answers Additional comments/Guidelines Mark AO 02.1 Max 3 from  Use of 끫롸 = 끫롸010 끫롸끫롸 10 to find intensity a Intensity reduction factor of 0.40 b Multiply the intensity by 0.40 or 0.60 c Use of 끫롸끫롸 = 10log � 끫롸 끫롸0 � to find intensity level d 106 (dB) 

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000001




AQA
MARK SCHEME AQA




A-level
PHYSICS
7408/3BB
Paper 3 Section B Medical physics
Mark scheme
June 2024




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Version: 1.0 Final IC
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PH




Page 1 of 14

, 000002


MARK SCHEME – A-LEVEL PHYSICS – 7408/3BB – 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.




S
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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Page 2 of 14

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Subido en
4 de noviembre de 2024
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