2019年11月IB物理(SL)真题PDF下载-Paper3
1.A student investigates how the period T of a simple pendulum varies with the maximum speed v of the pendulum’s bob by releasing the pendulum from rest from different initial angles. A graph of the variation of T with v is plotted.
(a) Suggest, by reference to the graph, why it is unlikely that the relationship between T and v is linear.
(b) Determine the fractional uncertainty in v when T = 2.115 s, correct to one significant figure.
(c) The student hypothesizes that the relationship between T and v is T = a + bv2, where a and b are constants. To verify this hypothesis a graph showing the variation of T with v2 is plotted. The graph shows the data and the line of best fit.
Determine b, giving an appropriate unit for b.
(d) The lines of the minimum and maximum gradient are shown.
Estimate the absolute uncertainty in a.
2. The resistance R of a wire of length L can be measured using the circuit shown.
(a) In one experiment the wire has a uniform diameter of d = 0.500 mm. The graph shows data obtained for the variation of R with L.
The gradient of the line of best fit is 6.30 Ω m–1.
(i) Estimate the resistivity of the material of the wire. Give your answer to an appropriate number of significant figures.
(ii) Explain, by reference to the power dissipated in the wire, the advantage of the fixed resistor connected in series with the wire for the measurement of R.
(b) The experiment is repeated using a wire made of the same material but of a larger diameter than the wire in part (a). On the axes in part (a), draw the graph for this second experiment.
2019年11月IB物理(SL)真题余下省略！
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