2013年5月IB物理(SL)真题PDF下载-paper2
A1. Data analysis question.
A particular semiconductor device generates an emf, which varies with light intensity.The diagram shows the experimental arrangement which a student used to investigate the variation with distance d of the emf ε . The power output of the lamp was constant. (The power supply for the lamp is not shown.)
The table shows how ε varied with d.
(a) Outline why the student has recorded the ε values to different numbers of significant digits but the same number of decimal places.
(b) On looking at the results the student suggests that ε could be inversely proportional to d.He proceeds to multiply each d value by the corresponding value of ε .
(i) Explain why this procedure can be used to disprove the student’s suggestion but it cannot prove it.
(ii) Using the data for d values of 19.1 cm, 16.0 cm and 10.0 cm discuss whether or not ε is inversely proportional to d.
(c) The graph shows some of the data points with the uncertainty in the d values. On the graph
(i) draw the data point corresponding to the value of d = 19.1 cm.
(ii) assuming that there is a constant absolute uncertainty in measuring all values of d, draw the error bar for the data point in (c)(i).
(iii) sketch the line of best-fit for all the plotted points.
(d) All values of ε have a percentage uncertainty of ±3 %. Calculate the percentage uncertainty in the product dε for the value of d = 18.0 cm.
A2. This question is about circular motion.
The diagram shows a car moving at a constant speed over a curved bridge. At the position shown, the top surface of the bridge has a radius of curvature of 50 m.
(a) Explain why the car is accelerating even though it is moving with a constant speed.
(b) On the diagram, draw and label the vertical forces acting on the car in the position shown.
(c) Calculate the maximum speed at which the car will stay in contact with the bridge.
A3. This question is about the superposition of waves.
(a) State what is meant by the principle of superposition of waves.
(b) The diagram shows two point sources of sound, X and Y. Each source emits waves of wavelength 1.1 m and amplitude A. Over the distances shown, any decrease in amplitude can be neglected. The two sources vibrate in phase. Points O and P are on a line 4.0 m from the line connecting X and Y. O is opposite the midpoint of XY and P is 0.75 m from O.
(i) Explain why the intensity of the sound at O is 4A2.
(ii) Deduce that no sound is detected at P.
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