AQA AS PHYSICS Paper 1 MAY 2023

Aqa AS PHYSICS Paper 1 Wednesday 17 May 2023 Morning Time allowed: 1 hour 30 minutes Materials For this paper you must have: • a pencil and a ruler • a scientific calculator • a Data and Formulae Booklet • a protractor. Instructions • Use black ink or black ball-point pen. • Fill in the boxes at the top of this page. • Answer all questions. • You must answer the questions in the spaces provided. Do not write outside the box around each page or on blank pages. • If you need extra space for your answer(s), use the lined pages at the end of this book. Write the question number against your answer(s). • Do all rough work in this book. Cross through any work you do not want to be marked. • Show all your working. Information • The marks for questions are shown in brackets. • The maximum mark for this paper is 70. • You are expected to use a scientific calculator where appropriate. • A Data and Formulae Booklet is provided as a loose insert. 7407/1 Answer all questions in the spaces provided. box A strong interaction between a negative kaon (K−) and a proton (p) produces an omega-minus (Ω−) particle, a neutral kaon (K0) and an unidentified particle Y. The interaction is: K− + p → Ω− + K0 + Y Table 1 contains information on the particles in this interaction. Table 1 K− p Ω− K0 Y Rest energy / MeV 493.8 938.3 1672 497.8 493.8 Baryon number +1 +1 0 Charge −1e +1e −1e 0 Strangeness −1 0 −3 +1 . Complete Table 1. [2 marks] . Calculate, in J, the rest energy of the Ω−. [2 marks] rest energy = J 0 1 . 3 Suggest how energy is conserved in this interaction. Refer to the rest energies of the particles in Table 1. [2 marks] The quark structure of the Ω− particle is sss. The Ω− is unstable. It decays into a proton through a series of decays: Ω− → Ξ0 + π− followed by Ξ0 → Λ0 + π0 followed by Λ0 → p + π− The Ξ0 and Λ0 are both hadrons. 0 1 . 4 Deduce the quark structure of the Λ0 particle. [4 marks] quark structure of Λ0 = Question 1 continues on the next page