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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Advanced Level * 4 5 7 0 8 9 7 8 2 5 * PHYSICS 9702/52 Paper 5 Planning,…
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Advanced Level * 4 5 7 0 8 9 7 8 2 5 * PHYSICS 9702/52 Paper 5 Planning, Analysis and Evaluation May/June 2013 1 hour 15 minutes Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your Centre number, candidate number and name on all the work you hand in. Write in dark blue or black pen. You may use a pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. Answer all questions. Electronic calculators may be used. You may lose marks if you do not show your working or if you do not use appropriate units. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. This document consists of 8 printed pages. DC (AC/JG) 61225/3 © UCLES 2013 [Turn over 2 1 A student is investigating how the peak alternating current I0 varies with frequency f in a For circuit containing a coil of wire. Examiner’s Use It is suggested that 2 V0 = R 2 + 4π 2f 2L2 I0 where R is the resistance of the coil, V0 is the peak voltage and L is a constant. Design a laboratory experiment to test the relationship between I0 and f and determine a value for L. You should draw a diagram, on page 3, showing the arrangement of your equipment. In your account you should pay particular attention to (a) the procedure to be followed, (b) the measurements to be taken, (c) the control of variables, (d) the analysis of the data, (e) the safety precautions to be taken. [15] © UCLES 2013 9702/52/M/J/13 3 Diagram For Examiner’s Use ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... © UCLES 2013 9702/52/M/J/13 [Turn over 4 For ......................................................................................................................................................... Examiner’s Use ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... Defining the Methods of Method of Safety Additional For problem data collection analysis considerations detail Examiner’s Use © UCLES 2013 9702/52/M/J/13 5 2 An electron beam is accelerated by a voltage V before entering a uniform electric field of For electric field strength E between two parallel plates. Examiner’s Use The electron beam travels a horizontal distance a parallel to the plates before hitting the top plate after being deflected through a vertical distance b. The path of the electrons is shown in Fig. 2.1. + b electron beam a – Fig. 2.1 For different values of V, the horizontal distance a is recorded. Question 2 continues on the next page. © UCLES 2013 9702/52/M/J/13 [Turn over 6 It is suggested that V and a are related by the equation For Examiner’s a= 4Vb . Use E (a) A graph is plotted of a 2 on the y-axis against V on the x-axis. Determine an expression for the gradient in terms of E. gradient = .................................................. [1] (b) Values of V and a are given in Fig. 2.2. V/ V a / 10−2 m 1000 6.6 ± 0.1 1200 7.2 ± 0.1 1400 7.8 ± 0.1 1600 8.4 ± 0.1 1800 8.9 ± 0.1 2000 9.4 ± 0.1 Fig. 2.2 Calculate and record values of a 2 / 10−4 m2 in Fig. 2.2. Include the absolute uncertainties in a 2. [3] (c) (i) Plot a graph of a 2 / 10−4 m2 against V / V. Include error bars for a 2. [2] (ii) Draw the straight line of best fit and a worst acceptable straight line on your graph. Both lines should be clearly labelled. [2] (iii) Determine the gradient of the line of best fit. Include the uncertainty in your answer. gradient = ................................................. [2] © UCLES 2013 9702/52/M/J/13 7 95 For Examiner’s Use 90 a 2 / 10–4 m2 85 80 75 70 65 60 55 50 45 40 800 1000 1200 1400 1600 1800 2000 2200 V/V © UCLES 2013 9702/52/M/J/13 [Turn over 8 (d) (i) Using your answer to (c)(iii), determine a value for E. Include an appropriate unit in For your answer. Examiner’s Use Data: b = (4.0 ± 0.1) × 10−2 m E = ................................................... [2] (ii) Determine the percentage uncertainty in your value of E. percentage uncertainty = ..............................................% [1] (e) Using your answers to (d), determine a value for V to give a distance a = 5.0 ± 0.1 cm. Include the absolute uncertainty in your answer. V = ...............................................V [2] Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will be pleased to make amends at the earliest possible opportunity. University of Cambridge International Examinations is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge. © UCLES 2013 9702/52/M/J/13
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