PHYA1 (JAN12PHYA101) General Certificate of Education Advanced Subsidiary Examination January Particles, Quantum Phenomena and Electricity TOTAL

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1 Centre Number Surname Candidate Number For Examiner s Use Other Names Candidate Signature Examiner s Initials Physics A Unit 1 For this paper you must have: l a pencil and a ruler l a calculator l a Data and Formulae Booklet (enclosed). General Certificate of Education Advanced Subsidiary Examination January 2012 Particles, Quantum Phenomena and Electricity Thursday 12 January pm to 2.45 pm PHYA1 Question TOTAL Mark Time allowed l 1 hour 15 minutes Instructions l Use black ink or black ball-point pen. l Fill in the es at the top of this page. l Answer all questions. l You must answer the questions in the spaces provided. around each page or on blank pages. l Do all rough work in this book. Cross through any work you do not want to be marked. l Show all your working. Information l The marks for questions are shown in brackets. l The maximum mark for this paper is 70. l You are expected to use a calculator where appropriate. l A Data and Formulae Booklet is provided as a loose insert. l You will be marked on your ability to: use good English organise information clearly use specialist vocabulary where appropriate. (JAN12PHYA101) PHYA1

2 2 Answer all questions in the spaces provided. 1 (a) The table gives information about some fundamental particles. Complete the table by filling in the missing information. particle quark structure charge strangeness baryon number uud 0 Sigma + uus (b) Each of the particles in the table has an antiparticle. 1 (b) (i) Give one example of a baryon particle and its corresponding antiparticle. (7 marks) particle... antiparticle... 1 (b) (ii) State the quark structure of an antibaryon. ud (b) (iii) Give one property of an antiparticle that is the same for its corresponding particle and one property that is different. Same... Different (02)

3 3 2 (a) State what is meant by the specific charge of a nucleus and give an appropriate unit for this quantity. unit:... 2 (b) Nucleus X has the same nucleon number as nucleus Y. The specific charge of X is 1.25 times greater than that of Y. 2 (b) (i) Explain, in terms of protons and neutrons, why the specific charge of X is greater than that of Y (b) (ii) Nucleus X is B. Deduce the number of protons and the number of neutrons in nucleus Y. number of protons... number of neutrons... (4 marks) 8 Turn over (03)

4 4 3 (a) Pair production can occur when a photon interacts with matter. Explain the process of pair production. 3 (b) Explain why pair production cannot take place if the frequency of the photon is below a certain value. (3 marks) 3 (c) Energy and momentum are conserved during pair production. State two other quantities that must also be conserved. 7 (04)

5 5 4 (a) When free electrons collide with atoms in their ground state, the atoms can be excited or ionised. 4 (a) (i) State what is meant by ground state. 4 (a) (ii) Explain the difference between excitation and ionisation. (3 marks) 4 (b) An atom can also become excited by the absorption of photons. Explain why only photons of certain frequencies cause excitation in a particular atom. (4 marks) Question 4 continues on the next page Turn over (05)

6 6 4 (c) The ionisation energy of hydrogen is 13.6 ev. Calculate the minimum frequency necessary for a photon to cause the ionisation of a hydrogen atom. Give your answer to an appropriate number of significant figures. answer...hz (4 marks) 12 5 (a) A student is given a piece of metal wire and asked to investigate how the resistance of the wire changes between a temperature of 0 o C and 100 o C. 5 (a) (i) Draw a labelled diagram of a suitable arrangement that would enable the student to carry out the experiment. (3 marks) (06)

7 7 5 (a) (ii) Describe the procedure the student would follow in order to obtain accurate and reliable measurements of the resistance of the wire at different temperatures between 0 o C and 100 o C. The quality of written communication will be assessed in your answer. (6 marks) Question 5 continues on the next page Turn over (07)

8 8 5 (b) A certain metal has a critical temperature of 268 o C (5 K). Explain what is meant by critical temperature X and Y are two lamps. X is rated at 12 V 36 W and Y at 4.5 V 2.0 W. 6 (a) Calculate the current in each lamp when it is operated at its correct working voltage. X... A Y... A 6 (b) The two lamps are connected in the circuit shown in Figure 1. The battery has an emf of 24 V and negligible internal resistance. The resistors, R 1 and R 2 are chosen so that the lamps are operating at their correct working voltage. Figure 1 24 V R 2 Y R 1 X V (08)

9 9 6 (b) (i) Calculate the pd across R 1. answer... V 6 (b) (ii) Calculate the current in R 1. answer... A 6 (b) (iii) Calculate the resistance of R 1. answer... Ω 6 (b) (iv) Calculate the pd across R 2. answer... V 6 (b) (v) Calculate the resistance of R 2. answer... Ω Question 6 continues on the next page Turn over (09)

10 10 6 (c) The filament of the lamp in X breaks and the lamp no longer conducts. It is observed that the voltmeter reading decreases and lamp Y glows more brightly. 6 (c) (i) Explain without calculation why the voltmeter reading decreases. 6 (c) (ii) Explain without calculation why the lamp Y glows more brightly A battery of emf 9.0 V and internal resistance, r, is connected in the circuit shown in Figure 2. Figure V r A 2.0 Ω B 6.0 Ω 2.0 Ω (10)

11 11 7 (a) The current in the battery is 1.0 A. 7 (a) (i) Calculate the pd between points A and B in the circuit. 7 (a) (ii) Calculate the internal resistance, r. answer =... V 7 (a) (iii) Calculate the total energy transformed by the battery in 5.0 minutes. answer =... Ω answer =... J 7 (a) (iv) Calculate the percentage of the energy calculated in part (iii) that is dissipated in the battery in 5.0 minutes. answer... % Question 7 continues on the next page Turn over (11)

12 12 7 (b) State and explain one reason why it is an advantage for a rechargeable battery to have a low internal resistance. 10 END OF QUESTIONS Copyright 2012 AQA and its licensors. All rights reserved. (12)

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