A-level PHYSICS Paper 1

A-level PHYSICS Paper 1 Wednesday 24 May 2023 Afternoon Time allowed: 2 hours 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 85. • You are expected to use a scientific calculator where appropriate. • A Data and Formulae Booklet is provided as a loose insert. * * IB/M/Jun23/E8 7408/1 Section A Answer all questions in this section. box The neutral lambda particle Λ0 is a baryon with a strangeness of −1 One possible decay for a Λ0 is 0  0 +n . Deduce the quark structure of a Λ0. [1 mark] . State and explain which interaction is involved in this decay. [2 marks] . An antiparticle of the neutral lambda particle decays into a neutral pion and particle X. Identify X. [1 mark] . The rest energy of a Λ0 is equal to the energy of a photon with a frequency of 2.69 × 1023 Hz. Determine, in MeV, the rest energy of a Λ0. [1 mark] box