OCR October 2021 – AS Level Physics A H156/02 Depth in physics qp

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OCR October 2021 – AS Level Physics A H156/02 Depth in physics qp Thursday 14 October 2021 – Morning AS Level Physics A H156/02 Depth in physics Time allowed: 1 hour 30 minutes *8324294224* ... *H15602* Your text here 1 2 © OCR 2021 Answer all the questions. 1 Two loudspeakers S1 and S2 are connected to a signal generator. The loudspeakers emit coherent sound waves. (a) State what is meant by the term coherent. ................................................................................................................................................... .............................................................................................................................................. [1] (b) A microphone is connected to an oscilloscope. The points O, J, K and L all lie on a straight line as shown. The microphone is moved from O to L. L K J O S1 S2 Not to scale A series of maxima and minima is observed between O and L. The microphone records a maximum at O. As it moves towards L, the first minimum is observed at J and the next maximum at K. The distance between S1 and J is 2.00m and the distance between S2 and J is 2.08m. The distance between S1 and K is 2.05m and the distance between S2 and K is 2.21m. (i) Calculate the path difference at point J between the waves from S1 and S2. path difference = ..................................................... m [1] (ii) State the phase difference in radian at point J between the waves from S1 and S2. phase difference = ................................................... rad [1] 3 © OCR 2021 Turn over (iii) Show that the wavelength of the sound waves is 0.16m. [1] (c) The frequency of the sound is determined using the oscilloscope. (i) Explain how the oscilloscope is used to determine the frequency. ........................................................................................................................................... ........................................................................................................................................... ...................................................................................................................................... [2] (ii) The frequency of the sound is 2.1kHz. Determine the speed v of sound. v = ................................................ ms−1 [2] 4 © OCR 2021 2 (a) The force F against extension x graph below shows the loading and unloading of a piece of rubber. 0 5 10 15 0 0.05 0.10 0.15 0.20 0.25 0.30 F/N x /m loading unloading (i) State the physical quantity represented by the area under the loading curve. ...................................................................................................................................... [1] (ii) Determine the energy E transferred when the rubber is stretched to an extension of 0.25m. E = ....................................................... J [2] (iii) Suggest why the energy transferred by the rubber during unloading is different to your answer in (ii). ........................................................................................................................................... ...................................................................................................................................... [1] (b) A metal wire has length 2.2m and cross-sectional area of 1.4 × 10−7m2. One end of the wire is fixed to the ceiling and a load of weight 49N is attached to the other end so that the wire is vertical. The Young modulus of the metal is 180GPa. The wire obeys Hooke’s law. 5 © OCR 2021 Turn over Calculate (i) the stress σ in the wire σ = .................................................... Pa [2] (ii) the strain ε of the wire ε = ......................................................... [2] (iii) the extension x of the wire x = ..................................................... m [2] (iv) the elastic potential energy E of the wire. E = ....................................................... J [2] (c) The wire in (b) is replaced by a wire of the same metal and length but double the diameter. The same load is attached to the wire. State and explain the change, if any, to the elastic potential energy of the wire. ................................................................................................................................................... ................................................................................................................................................... .............................................................................................................................................. [2] 6 © OCR 2021 3 (a)* A linear air track is used to investigate the collision of two gliders A and B, as shown in Fig. 3.1. glider A glider B v = 0m s v = 0.200 m s –1 –1 light gate 1 light gate 2 air track to data-logger Fig. 3.1 Light gates 1 and 2 are connected to a data-logger to determine the speed of the gliders. Glider A has a mass of 0.75kg and glider B has a mass of 1.25kg. Two experiments are carried out. Experiment 1 • Glider B is initially at rest between light gates 1 and 2. • Glider A passes light gate 1 at a speed of 0.200ms−1. • Glider A collides with glider B. • Glider A rebounds and passes light gate 1 at a speed of 0.050ms−1 and glider B passes light gate 2 at a speed of 0.150ms−1. Experiment 2 • Glider B is initially at rest between light gates 1 and 2. • Glider A passes light gate 1 at a speed of 0.200ms−1. • Glider A collides with glider B. • Glider A sticks to glider B. • Both gliders pass light gate 2 at a speed of 0.075ms−1. With the help of calculations and the terms below, explain the results of the two experiments.Thursday 14 October 2021 – Morning AS Level Physics A H156/02 Depth in physics Time allowed: 1 hour 30 minutes *8324294224* *H15602* Your text here 1 2 © OCR 2021 Answer all the questions. 1 Two loudspeakers S1 and S2 are connected to a signal generator. The loudspeakers emit coherent sound waves. (a) State what is meant by the term coherent. ................................................................................................................................................... .............................................................................................................................................. [1] (b) A microphone is connected to an oscilloscope. The points O, J, K and L all lie on a straight line as shown. The microphone is moved from O to L. L K J O S1 S2 Not to scale A series of maxima and minima is observed between O and L. The microphone records a maximum at O. As it moves towards L, the first minimum is observed at J and the next maximum at K. The distance between S1 and J is 2.00m and the distance between S2 and J is 2.08m. The distance between S1 and K is 2.05m and the distance between S2 and K is 2.21m. (i) Calculate the path difference at point J between the waves from S1 and S2. path difference = ..................................................... m [1] (ii) State the phase difference in radian at point J between the waves from S1 and S2. phase difference = ................................................... rad [1] 3 © OCR 2021 Turn over (iii) Show that the wavelength of the sound waves is 0.16m. [1] (c) The frequency of the sound is determined using the oscilloscope. (i) Explain how the oscilloscope is used to determine the frequency. ........................................................................................................................................... ........................................................................................................................................... ...................................................................................................................................... [2] (ii) The frequency of the sound is 2.1kHz. Determine the speed v of sound. v = ................................................ ms−1 [2] 4 © OCR 2021 2 (a) The force F against extension x graph below shows the loading and unloading of a piece of rubber. 0 5 10 15 0 0.05 0.10 0.15 0.20 0.25 0.30 F/N x /m loading unloading (i) State the physical quantity represented by the area under the loading curve. ...................................................................................................................................... [1] (ii) Determine the energy E transferred when the rubber is stretched to an extension of 0.25m. E = ....................................................... J [2] (iii) Suggest why the energy transferred by the rubber during unloading is different to your answer in (ii). ........................................................................................................................................... ...................................................................................................................................... [1] (b) A metal wire has length 2.2m and cross-sectional area of 1.4 × 10−7m2. One end of the wire is fixed to the ceiling and a load of weight 49N is attached to the other end so that the wire is vertical. The Young modulus of the metal is 180GPa. The wire obeys Hooke’s law. 5 © OCR 2021 Turn over Calculate (i) the stress σ in the wire σ = .................................................... Pa [2] (ii) the strain ε of the wire ε = ......................................................... [2] (iii) the extension x of the wire x = ..................................................... m [2] (iv) the elastic potential energy E of the wire. E = ....................................................... J [2] (c) The wire in (b) is replaced by a wire of the same metal and length but double the diameter. The same load is attached to the wire. State and explain the change, if any, to the elastic potential energy of the wire. ................................................................................................................................................... ................................................................................................................................................... .............................................................................................................................................. [2] 6 © OCR 2021 3 (a)* A linear air track is used to investigate the collision of two gliders A and B, as shown in Fig. 3.1. glider A glider B v = 0m s v = 0.200 m s –1 –1 light gate 1 light gate 2 air track to data-logger Fig. 3.1 Light gates 1 and 2 are connected to a data-logger to determine the speed of the gliders. Glider A has a mass of 0.75kg and glider B has a mass of 1.25kg. Two experiments are carried out. Experiment 1 • Glider B is initially at rest between light gates 1 and 2. • Glider A passes light gate 1 at a speed of 0.200ms−1. • Glider A collides with glider B. • Glider A rebounds and passes light gate 1 at a speed of 0.050ms−1 and glider B passes light gate 2 at a speed of 0.150ms−1. Experiment 2 • Glider B is initially at rest between light gates 1 and 2. • Glider A passes light gate 1 at a speed of 0.200ms−1. • Glider A collides with glider B. • Glider A sticks to glider B. • Both gliders pass light gate 2 at a speed of 0.075ms−1. With the help of calculations and the terms below, explain the results of the two experiments [Show More]

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