CAPE Physics Unit 2 · 2012 · Paper 2

42 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)2 marksMark on Figure 1 the direction of current in wire AB and state the name of the rule used to determine this direction.
2. 1(a)(ii)1 markShow, on the provided diagram of poles N and S with wire AB, the magnetic field lines when current flows in AB.
3. 1(b)(i)3 marksShow that at equilibrium, the current through the circuit is given by I = mgx / (BLy), where L is the length of wire AB.
4. 1(b)(ii)3 marksDescribe how the apparatus is used to obtain a set of readings for I and x, stating clearly how results are taken.
5. 1(c)(i)1 markDraw the best straight line through the data plotted in Figure 2.
6. 1(c)(ii)2 marksDetermine the gradient of the best line drawn on Figure 2.
7. 1(c)(iii)3 marksGiven that y = 2.0 cm, L = 5.0 cm, and m = 0.50 g, calculate the magnetic flux density, B, of the magnet.
8. 2(a)(i)3 marksAdd a resistor to the op-amp circuit in Figure 3 so it becomes a non-inverting amplifier with a theoretical gain of +10, and label it with the required resistance value.
9. 2(a)(ii)3 marksShow on Figure 3 how meters and a potential divider would be connected to enable data collection of Vin and Vout.
10. 2(b)(i)6 marksOn the grid provided on page 7, plot the characteristic curve of Vout vs Vin for the non-inverting amplifier using data from Table 1.
11. 2(b)(ii)3 marksFrom the plotted graph, determine the gain of the amplifier to 3 significant figures.
12. 3(a)(i)1 markState the name of the scientist credited with the explanation of the photoelectric effect.
13. 3(a)(ii)a)1 markExplain what is meant by 'threshold frequency' with reference to the photoelectric effect.
14. 3(a)(ii)b)1 markExplain what is meant by 'work function' with reference to the photoelectric effect.
15. 3(b)(i)1 markFill in the missing values of frequency in Table 2.
16. 3(b)(ii)4 marksOn the grid provided on page 11, plot a graph of stopping potential energy versus frequency for the metal.
17. 3(b)(iii)a)4 marksUse your graph to determine the value of Planck's constant.
18. 3(b)(iii)b)3 marksUse your graph to determine the work function of the metal.
19. 4(a)(i)2 marksDefine the terms 'capacitance' and 'farad'.
20. 4(a)(ii)a)1 markWrite an expression for the net capacitance of three capacitors C1, C2, C3 connected in series.
21. 4(a)(ii)b)1 markWrite an expression for the net capacitance of three capacitors C1, C2, C3 connected in parallel.
22. 4(a)(iii)1 markState what is meant by the term 'time constant' for a capacitor discharge circuit.
23. 4(b)(i)a)2 marksCalculate the time between flashes (time for the uncharged capacitor to reach 110 V from a 120 V supply via 1.0 MΩ and 1.0 μF).
24. 4(b)(i)b)2 marksCalculate the duration of each flash, given discharge through 10 Ω takes three time constants.
25. 4(b)(i)c)2 marksCalculate the energy released in each flash.
26. 4(b)(ii)4 marksIt is claimed that during the flash, the light is as bright as that from a 200 W light bulb. Comment on this statement.
27. 5(a)(i)1 markState the type of amplifier circuit shown in Figure 7.
28. 5(a)(ii)1 markState what is meant by 'negative feedback' in this amplifier.
29. 5(a)(iii)a)2 marksCalculate the gain of this amplifier at low frequencies.
30. 5(a)(iii)b)3 marksCalculate the bandwidth of the amplifier using Figures 6 and 7.
31. 5(a)(iv)2 marksWhat is the peak output voltage for an input signal of peak value 0.052 V and frequency 1.0 x 10^4 Hz?
32. 5(b)(i)3 marksCopy and complete the truth table (Table 3) for the digital circuit shown in Figure 8.
33. 5(b)(ii)a)1 markState whether the thermistor RT is hot or cold for logic 1 at input A.
34. 5(b)(ii)b)1 markState whether the LDR RL is in light or darkness for logic 1 at input B.
35. 5(b)(ii)c)1 markDeduce the environmental conditions required for the LED to be conducting.
36. 6(a)(i)2 marksState the number of protons, neutrons, and electrons in a neutral atom of 226_86 Rn.
37. 6(a)(ii)2 marksExplain what is meant by the term 'isotope'.
38. 6(b)3 marksDefine 'half-life' and 'decay constant, λ' for a radioactive nucleus, and write an equation relating the two quantities.
39. 6(c)(i)2 marksDetermine the number of nuclei in the 3.50 μg sample of pure 11_6 C at t = 0.
40. 6(c)(ii)2 marksDetermine the decay constant of the carbon-11 sample.
41. 6(c)(iii)2 marksDetermine the activity of the sample at t = 0.
42. 6(c)(iv)2 marksDetermine the activity of the carbon-11 after 8 hours.