Cambridge International Examinations Cambridge International Advanced Subsidiary and Advanced Level

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1 Cambridge International Examinations Cambridge International Advanced Subsidiary and Advanced Level * * PHYSICS 9702/21 Paper 2 AS Structured Questions May/June 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 an HB pencil for any diagrams or graphs. Do not use staples, paper clips, 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 16 printed pages. DC (LK) 92821/2 [Turn over

2 2 Data speed of light in free space, c = ms 1 permeability of free space, μ 0 = 4π 10 7 Hm 1 permittivity of free space, ε 0 = Fm 1 1 ( = πε 9 m F 1 ) 0 elementary charge, the Planck constant, unified atomic mass constant, rest mass of electron, rest mass of proton, e = C h = Js u = kg m e = kg m p = kg molar gas constant, R = 8.31 J K 1 mol 1 the Avogadro constant, N A = mol 1 the Boltzmann constant, k = JK 1 gravitational constant, G = Nm 2 kg 2 acceleration of free fall, g = 9.81 m s 2

3 3 Formulae uniformly accelerated motion, s = ut + at 2 v 2 = u 2 + 2as work done on/by a gas, gravitational potential, hydrostatic pressure, W = pδv φ = Gm r p = ρgh pressure of an ideal gas, p = Nm V <c 2 > simple harmonic motion, velocity of particle in s.h.m., a = ω 2 x v = v 0 cos ωt v = ± ω (x 0 2 x 2 ) electric potential, Q V = 4πε 0 r capacitors in series, 1/C = 1/C 1 + 1/C capacitors in parallel, C = C 1 + C energy of charged capacitor, W = QV resistors in series, R = R 1 + R resistors in parallel, 1/R = 1/R 1 + 1/R alternating current/voltage, radioactive decay, x = x 0 sin ω t x = x 0 exp( λt) decay constant, λ = t [Turn over

4 4 Answer all the questions in the spaces provided. 1 (a) Use the definition of power to show that the SI base units of power are kg m 2 s 3. (b) Use an expression for electrical power to determine the SI base units of potential difference. [2] units...[2]

5 5 2 (a) Define speed and velocity and use these definitions to explain why one of these quantities is a scalar and the other is a vector. speed:... velocity:... [2] (b) A ball is released from rest and falls vertically. The ball hits the ground and rebounds vertically, as shown in Fig ball initial position rebound ground Fig. 2.1 [Turn over

6 The variation with time t of the velocity v of the ball is shown in Fig v / m s t / s Fig. 2.2 Air resistance is negligible. (i) Without calculation, use Fig. 2.2 to describe the variation with time t of the velocity of the ball from t = 0 to t = 2.1 s [3] (ii) Calculate the acceleration of the ball after it rebounds from the ground. Show your working. acceleration =... m s 2 [3]

7 (iii) Calculate, for the ball, from t = 0 to t = 2.1 s, 1. the distance moved, 7 2. the displacement from the initial position. distance =... m [3] displacement =... m [2] (iv) On Fig. 2.3, sketch the variation with t of the speed of the ball speed / m s t / s Fig. 2.3 [2] [Turn over

8 3 Two balls X and Y are supported by long strings, as shown in Fig X 4.5 m s 1 Y 2.8 m s 1 Fig. 3.1 The balls are each pulled back and pushed towards each other. When the balls collide at the position shown in Fig. 3.1, the strings are vertical. The balls rebound in opposite directions. Fig. 3.2 shows data for X and Y during this collision. ball mass velocity just before collision / m s 1 velocity just after collision / m s 1 X 50 g Y M Fig. 3.2 The positive direction is horizontal and to the right. (a) Use the conservation of linear momentum to determine the mass M of Y. M =... g [3]

9 (b) State and explain whether the collision is elastic. 9...[1] (c) Use Newton s second and third laws to explain why the magnitude of the change in momentum of each ball is the same....[3] [Turn over

10 4 A spring is kept horizontal by attaching it to points A and B, as shown in Fig cart, mass 1.7 kg v slider spring support A B Fig. 4.1 Point A is on a movable slider and point B is on a fixed support. A cart of mass 1.7 kg has horizontal velocity v towards the slider. The cart collides with the slider. The spring is compressed as the cart comes to rest. The variation of compression x of the spring with force F exerted on the spring is shown in Fig F / N x / cm Fig. 4.2 Fig. 4.2 shows the compression of the spring for F = 1.5 N to F = 4.5 N. The cart comes to rest when F is 4.5 N. (a) Use Fig. 4.2 to (i) show that the compression of the spring obeys Hooke s law, [2]

11 11 (ii) determine the spring constant of the spring, spring constant =... N m 1 [2] (iii) determine the elastic potential energy E P stored in the spring due to the cart being brought to rest. E P =... J [3] (b) Calculate the speed v of the cart as it makes contact with the slider. Assume that all the kinetic energy of the cart is converted to the elastic potential energy of the spring. speed =... m s 1 [2] [Turn over

12 12 5 The variation with potential difference (p.d.) V of current I for a semiconductor diode is shown in Fig I / ma V / V Fig. 5.1 (a) Use Fig. 5.1 to describe the variation of the resistance of the diode between V = 0.5 V and V = 0.8 V....[2] (b) On Fig. 5.2, sketch the variation with p.d. V of current I for a filament lamp. Numerical values are not required. I 0 0 V Fig. 5.2 [2]

13 13 (c) Fig. 5.3 shows a power supply of electromotive force (e.m.f.) 12 V and internal resistance 0.50 Ω connected to a filament lamp and switch. 12 V 0.50 Ω Fig. 5.3 The filament lamp has a power of 36 W when the p.d. across it is 12 V. (i) Calculate the resistance of the lamp when the p.d. across it is 12 V. resistance =... Ω [1] (ii) The switch is closed and the current in the lamp is 2.8 A. Calculate the resistance of the lamp. resistance =... Ω [3] (d) Explain how the two values of resistance calculated in (c) provide evidence for the shape of the sketch you have drawn in (b)....[1] [Turn over

14 14 6 (a) State what is meant by diffraction and by interference. diffraction:... interference:... [3] (b) Light from a source S 1 is incident on a diffraction grating, as illustrated in Fig S 1 light diffraction grating zero order Fig. 6.1 (not to scale) The light has a single frequency of Hz. The diffraction grating has 650 lines per millimetre. Calculate the number of orders of diffracted light produced by the grating. Do not include the zero order. Show your working. number =... [3] (c) A second source S 2 is used in place of S 1. The light from S 2 has a single frequency lower than that of the light from S 1. State and explain whether more orders are seen with the light from S 2....[1]

15 7 (a) Explain what is meant by an electric field [1] (b) A uniform electric field is produced between two vertical metal plates AB and CD, as shown in Fig particle A C B 16 mm 450 V + D Fig. 7.1 The potential difference between the plates is 450 V and the separation of the plates is 16 mm. An α-particle is accelerated from plate AB to plate CD. (i) On Fig. 7.1, draw lines to represent the electric field between the plates. [2] (ii) Calculate the electric field strength between the plates. electric field strength =... V m 1 [2] (iii) Calculate the work done by the electric field on the α-particle as it moves from AB to CD. work done =... J [3] Question 7 continues on page 16. [Turn over

16 16 (iv) A β-particle moves from AB to CD. Calculate the ratio Show your working. work done by the electric field on the α-particle work done by the electric field on the β-particle. ratio =... [1] 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. To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced online in the Cambridge International Examinations Copyright Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download at after the live examination series. 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.

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