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# AQA_A Level Physics Paper 1_Mark Scheme 2022 | Practice Paper 1

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AQA_A Level Physics Paper 1_Mark Scheme 2022 | Practice Paper 1 Section A 1 (a) (i) any two eg proton, neutron 2 (ii) 1 (b) (i) contains a strange quark 1 or longer half life than expected or de... cays by weak interaction (ii) the second one because lepton number is not conserved 2 lepton number LHS = 0 RHS -1 + -1 = -2 (c) (i) weak (interaction) 1 (ii) X must be a baryon 2 baryon number on right hand side is +1 [Total 9 marks] 2 (a) (i) (moment = 520 x 0.26) = 140 (135.2) Nm 2 (ii) 180 x 0.41 and 0.63 X seen 3 135.2 = 180 x 0.41 + 0.63 X ecf from (a)(i) (X = (135.2 – 73.8) / 0.63) = 97 (N) (97.46) allow 105 from use of 140Nm ecf from (a)(i) (iii) (520 – (180 + 97.46)) 1 = 240 (242.5 N) ecf (or from correct moments calculation) [Total 6 marks] A-LEVEL PHYSICS MARK SCHEME Practice Paper 1 Maximum marks: 85 View detailed guidance on the conclusions you can draw from your students' performance in these papers on the MERiT welcome page. Understand how your students compare with others and target revision effectively by entering marks into MERiT. This document is licensed to Haggerston School - MB260045Page 2 3 (a) (momentum of air) increases ✔ 1 words implying increase (b) (rate of change of momentum so) force acting on the air (Newton 2) ✔ 3 it/air exerts force (on engine) of the same/equal magnitude/size ✔ but opposite in direction (Newton 3) ✔ - - - - [Show More]

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