PHYSICS (SPECIFICATION A) Unit 1 Particles, Radiation and Quantum Phenomena

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1 Surname Centre Number Other Names Candidate Number Leave blank Candidate Signature General Certificate of Education June 2003 Advanced Subsidiary Examination PHYSICS (SPECIFICATION A) Unit 1 Particles, Radiation and Quantum Phenomena PA01 Friday 6 June 2003 Afternoon Session In addition to this paper you will require: a calculator; a pencil and a ruler. Time allowed: 1 hour Instructions Use blue or black ink or ball-point pen. Fill in the boxes at the top of this page. Answer all questions in the spaces provided. All working must be shown. Do all rough work in this book. Cross through any work you do not want marked. Information The maximum mark for this paper is 50. Mark allocations are shown in brackets. The paper carries 30% of the total marks for Physics Advanced Subsidiary and carries 15% of the total marks for Physics Advanced. A Data Sheet is provided on pages 3 and 4. You may wish to detach this perforated sheet at the start of the examination. You are expected to use a calculator where appropriate. In questions requiring description and explanation you will be assessed on your ability to use an appropriate form and style of writing, to organise relevant information clearly and coherently, and to use specialist vocabulary where appropriate. The degree of legibility of your handwriting and the level of accuracy of your spelling, punctuation and grammar will also be taken into account. For Examiner s Use Number Mark Number Total (Column 1) Total (Column 2) TOTAL Examiner s Initials Mark

2 2 Data Sheet A perforated Data Sheet is provided as pages 3 and 4 of this question paper. This sheet may be useful for answering some of the questions in the examination. You may wish to detach this sheet before you begin work.

3 Data Sheet 3 Turn over

4 4

5 5 Answer all questions. 1 (a) A stable atom contains 28 nucleons. Write down a possible number of protons, neutrons and electrons contained in the atom.... protons... neutrons... electrons (b) An unstable isotope of uranium may split into a caesium nucleus, a rubidium nucleus and four neutrons in the following process U Cs + Rb + 4 n 55 X (i) Explain what is meant by isotopes. (ii) How many neutrons are there in the 55 Cs nucleus? 137 (iii) Calculate the ratio charge, in C kg 1, for the 92U nucleus. mass 236 (iv) Determine the value of X for the rubidium nucleus. X =... (6 marks) 8 Turn over

6 6 2 (a) (i) Underline the particles in the following list that may be affected by the weak interaction. positron neutron photon neutrino positive pion (ii) Underline the particles in the following list that may be affected by the electromagnetic force. electron antineutrino proton neutral pion negative muon (4 marks) (b) A positive muon may decay in the following way, µ + e + + ν e + ν µ. (i) Exchange each particle for its corresponding antiparticle and complete the equation to show how a negative muon may decay. µ (ii) Give one difference and one similarity between a negative muon and an electron. difference... similarity... (c) Complete the Feynman diagram, which represents electron capture, by labelling all the particles involved e W

7 7 3 A fluorescent light tube contains mercury vapour at low pressure. The tube is coated on the inside, and contains two electrodes. (a) Explain why the mercury vapour is at a low pressure. (1 mark) (b) Explain the purpose of the coating on the inside of the tube. You may be awarded marks for the quality of written communication in your answer. 4 TURN OVER FOR THE NEXT QUESTION Turn over

8 8 4 The graph shows how the maximum kinetic energy, E k, of electrons emitted from the surface of metal A, varies with the frequency, f, of the incident electromagnetic radiation. E k / J f / Hz (a) Explain the meaning of the term threshold frequency. (b) Calculate the work function of metal A, (i) in J, (ii) in ev.

9 9 (c) Metal A is exchanged for metal B. The work function of metal B is half that of metal A. Add a line to the graph opposite to show how the maximum kinetic energy of electrons emitted from metal B varies with frequency. (d) At a fixed frequency of the incident radiation, the emitted electrons are collected and a current is recorded. State and explain a change that may be made to increase this current. You may be awarded marks for the quality of written communication in your answer. 10 TURN OVER FOR THE NEXT QUESTION Turn over

10 10 5 The diagram below shows a liquid droplet placed on a cube of glass. A ray of light from air, incident normally on to the droplet, continues in a straight line and is refracted at the liquid to glass boundary as shown. refractive index of the glass = 1.45 air 29.2 liquid glass 26.6

11 11 (a) Calculate the speed of light (i) in the glass, (ii) in the liquid droplet. (b) Calculate the refractive index of the liquid. (c) On the diagram opposite, complete the path of the ray showing it emerge from the glass cube into the air. No further calculations are required. 7 Turn over

12 12 6 The diagram shows some of the energy levels of the mercury atom. energy/10 19 J 0.00 ionisation level 1.92 level D 2.56 level C 5.92 level B 8.80 level A (a) When electrons collide with mercury atoms, the atoms may be excited or may be ionised. Explain what is meant by (i) excitation, (ii) ionisation. (b) Determine the lowest frequency of emitted radiation with reference to the energy levels in the diagram. 4

13 13 7 (a) Electrons behave in two distinct ways. This is referred to as the duality of electrons. (i) State what is meant by the duality of electrons. (ii) Give one example of each type of behaviour of electrons. (b) Calculate the speed of electrons that have a de Broglie wavelength of m. 5 QUALITY OF WRITTEN COMMUNICATION 2 END OF QUESTIONS

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