AQA A Level PHYSICS (7408/1) Paper 1 Mark scheme June 2023 | VERIFIED.

AQA A Level PHYSICS (7408/1) Paper 1 Mark scheme June 2023 | VERIFIED. uds  Do not accept D for d. Penalise extra particles 1 AO3 Question Answers Additional comments/Guidelines Mark AO 01.2 weak (interaction / force) strangeness changes (in this decay) (from -1 to 0 and strangeness can only change in a weak interaction) MP2: Reject negative arguments (eg ‘strangeness is conserved in a strong interaction’) Reject the idea that strangeness always changes in a weak interaction. General statement of strangeness conservation in the weak interaction on its own is insufficient. Accept “strangeness is not conserved (in this decay)”. Condone “strangeness is lost”. 2 AO1 MARK SCHEME – A-LEVEL PHYSICS – 7408/1 – JUNE 2023 7 Question Answers Additional comments/Guidelines Mark AO 01.3 anti-neutron  Accept