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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Advanced Subsidiary Level and Advanced Level * 1 2 7 9 2 1 4 4 4 2 * PHYSICS 9702/21 Paper 2 AS Structured Questions
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  This document consists of 16  printed pages. DC (NF/SW) 29916/3 © UCLES 2011 [Turn over UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONSGeneral Certificate of EducationAdvanced Subsidiary Level and Advanced Level *127 9214442* PHYSICS   9702/21 Paper 2 AS Structured Questions May/June 2011   1 hour 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 soft 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.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. For Examiner’s Use1234567Total  2 9702/21/M/J/11 © UCLES 2011 Data speed of light in free space, c = 3.00 × 10 8  ms –1 permeability of free space, μ  0   = 4 π  × 10 –7  Hm –1 permittivity of free space, ε 0   = 8.85 × 10 –12  Fm –1  elementary charge, e = 1.60 × 10 –19  Cthe Planck constant, h = 6.63 × 10 –34  Jsunified atomic mass constant, u = 1.66 × 10 –27  kgrest mass of electron, m  e   = 9.11 × 10 –31  kgrest mass of proton, m  p   = 1.67 × 10 –27  kgmolar gas constant, R = 8.31 JK –1 mol –1 the Avogadro constant, N  A   = 6.02 × 10 23 mol –1 the Boltzmann constant, k = 1.38 × 10 –23  JK –1 gravitational constant, G = 6.67 × 10 –11  Nm 2 kg –2 acceleration of free fall, g = 9.81 ms –2  3 9702/21/M/J/11 © UCLES 2011 [Turn overFormulae uniformly accelerated motion, s   = ut +        at  2   v  2  = u  2   +   2 as  work done on/by a gas, W   = p   V  gravitational potential, φ   = –  Gm r  hydrostatic pressure, p   = ρ  gh  pressure of an ideal gas, p   =       Nm V  < c  2 >simple harmonic motion, a   = – ω    2 x  velocity of particle in s.h.m., v   = v  0  cos ω  t    v   = ± ω     √⎯⎯⎯⎯⎯⎯⎯⎯⎯ ( x  02  – x  2 )electric potential, V   = Q  4 π ε 0 r  capacitors in series, 1/  C   = 1/  C  1  + 1/  C  2  + . . .capacitors in parallel, C   = C  1  + C  2  + . . .energy of charged capacitor, W   =       QV  resistors in series, R   = R  1  + R  2  + . . .resistors in parallel, 1/  R   = 1/  R  1  + 1/  R  2  + . . .alternating current/voltage, x   = x  0 sin ω    t  radioactive decay, x   = x  0 exp(– λ  t  )decay constant, λ   = 0.693 t        4 9702/21/M/J/11 © UCLES 2011 For Examiner’s Use   Answer all  the questions in the spaces provided. 1 Measurements made for a sample of metal wire are shown in Fig. 1.1.quantitymeasurementuncertaintylength1750 mm± 3 mm diameter 0.38 mm± 0.01 mmresistance7.5 Ω ± 0.2 Ω Fig. 1.1 (a) State the appropriate instruments used to make each of these measurements.  (i) length ............................................................................................................................. [1]  (ii) diameter ............................................................................................................................. [1]  (iii) resistance ............................................................................................................................. [1]  (b) (i) Show that the resistivity of the metal is calculated to be 4.86 × 10 –7   Ω  m. [2]  (ii) Calculate the uncertainty in the resistivity. uncertainty = ± .......................................... Ω  m [4]
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