CAPE Physics Unit 2 · 2010 · Paper 2

31 questions and parts from this paper. Open one to see it in full, then practise it on Quelpr and get it marked against the mark scheme.

1. 1(a)(i)1 markDefine the term 'capacitance'.
2. 1(a)(ii)a)2 marksA capacitor of capacitance 2100 μF is charged to a potential difference of 6.0 V between plates. Determine the charge on one of the plates.
3. 1(a)(ii)b)2 marksDetermine the energy stored by the 2100 μF capacitor charged to 6.0 V.
4. 1(b)(i)8 marksTest the hypothesis that V is inversely proportional to t by reading data from Figure 2 to complete Table 1, and then plotting 1/V against t on the provided grid.
5. 1(b)(ii)2 marksState, with reasons, the conclusion which may be drawn from the data.
6. 2(a)(i)a)1 markExplain what is meant by P-type material.
7. 2(a)(i)b)1 markExplain what is meant by N-type material.
8. 2(a)(i)c)1 markExplain what is meant by the depletion region.
9. 2(a)(ii)2 marksDraw a diagram of a junction transistor and draw the transistor symbol.
10. 2(b)(i)1 markComplete Table 2 by filling in the missing values of ln(I / μA).
11. 2(b)(ii)4 marksPlot a graph of ln I versus V on the grid opposite and draw your best straight line through the points.
12. 2(b)(iii)1 markWrite the equation relating ln I and V.
13. 2(b)(iv)4 marksDetermine the ideality factor n using data: k = 1.38 × 10⁻²³ J K⁻¹ and elementary charge e = 1.60 × 10⁻¹⁹ C at T = 300 K.
14. 3(a)7 marksDescribe how to accurately measure the half-life of Radon-220, an α-emitter with a short half-life easily separated from its powdered solid parent, detailing required apparatus, procedure, and data processing.
15. 3(b)(i)5 marksCalculate how many α-particles would be emitted by a 4 mg sample of ²²⁰₈₆Rn in 108 seconds.
16. 3(b)(ii)3 marksA laboratory is deemed safe after a Radon-220 leak when the activity decreases to less than 0.1% of its original value. Calculate the MINIMUM number of minutes for which the laboratory must remain closed.
17. 4(a)4 marksState Kirchhoff's two laws for electrical circuits and give the physical principle that each law is based on.
18. 4(b)2 marksDistinguish between the 'e.m.f.' and the 'terminal p.d.' of a cell.
19. 4(c)(i)3 marksCalculate the current flowing through the 12 V battery.
20. 4(c)(ii)6 marksPoints a and b are connected by a wire of negligible resistance. Calculate the new value for the current that will flow through the 12 V battery.
21. 5(a)5 marksShow that the closed loop gain, A, of the non-inverting operational amplifier circuit in Figure 4 is given by A = (R_i + R_f) / R_i. Clearly state any assumptions made about the properties of the op-amp.
22. 5(b)(i)1 markWhat is the value of the output voltage when V_i = +250 mV?
23. 5(b)(ii)2 marksIf the op-amp is NOT to be saturated, what is the MAXIMUM voltage amplitude for the input signal?
24. 5(b)(iii)3 marksSketch a graph to show the expected output when a sinusoidal signal with an amplitude of 0.75 V is applied to the input of this amplifier.
25. 5(c)4 marksIn a certain application, it is desired to combine two signals, v₁ and v₂, to form a signal v₀ according to the relation v₀ = -2 v₁ - 5 v₂. The minimum input resistance for both signal inputs should be NO less than 10.0…
26. 6(a)(i)3 marksWith the aid of a sketch graph, clearly explain Continuous X-ray spectrum and how it originates.
27. 6(a)(ii)2 marksWith the aid of the sketch graph, clearly explain Characteristic X-ray spectrum and how it originates.
28. 6(a)(iii)2 marksWith the aid of the sketch graph, clearly explain Cut-off wavelength and how it originates.
29. 6(b)(i)2 marksCalculate the electrical power input.
30. 6(b)(ii)3 marksCalculate the speed of the electrons when they hit the target.
31. 6(b)(iii)3 marksCalculate the cut-off wavelength of the X-rays emitted.