CSEC Physics · May/June 2016 · Paper 2

27 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)8 marksUsing the grid on page 5, plot a graph of Activity (A) versus Time (t).
2. 1(b)(i)5 marksFrom your graph, determine the half-life of the sample.
3. 1(b)(ii)6 marksUsing your graph, determine a more accurate value of the half-life of the sample.
4. 1(c)2 marksFrom your graph, and using dotted lines, determine how long it takes for the activity of the sample to be reduced to 10 disintegrations per second, from its original activity level.
5. 1(d)1 markState ONE reason why a line drawn through all the points would not form a perfectly smooth curve.
6. 1(e)2 marksAll elements including radioactive substances have an 'atomic number' and 'mass number'. Explain what the two terms mean. Atomic number: Mass number:
7. 1(f)1 markIn medicine, Iodine-123, [¹²³₅₃I] is used to check a patient's thyroid function. What does '123' represent?
8. 2(a)2 marksComplete the bubbles in Figure 1 by inserting the SI unit which matches EACH of the physical quantities.
9. 2(b)(i)3 marksState Newton's third law of motion.
10. 2(b)(ii)4 marksWith the aid of a diagram, and using Newton's third law of motion, explain how this happens.
11. 2(c)(i)2 marksDefine the term 'linear momentum'.
12. 2(c)(ii)4 marksDetermine the final velocity of the balls.
13. 3(a)6 marksState, in words, the quantity EACH symbol represents in the equation E_H = mcΔθ. State the SI unit of EACH quantity as well. E_H: c: Δθ:
14. 3(b)1 markWhat does the symbol 'l' in the equation E_H = ml represent?
15. 3(c)(i)3 marksCalculate the heat lost by the water.
16. 3(c)(ii)2 marksCalculate the heat gained by the melted ice.
17. 3(c)(iii)3 marksAssuming the heat lost by the water is equal to the heat gained by the ice, calculate the specific latent heat of fusion of ice.
18. 4(a)6 marksList THREE types of electromagnetic waves in order of increasing wavelength. Identify a use of EACH type of wave.
19. 4(b)5 marksCalculate the wavelengths corresponding to EACH frequency.
20. 4(c)4 markscalculate the speed for this event.
21. 5(a)(i)4 marksHow does the electric current in a metal differ from that in an electrolyte? Compare EACH with 'conventional current'.
22. 5(a)(ii)2 marksState which of these two media (metal and electrolyte) has similar current flow to that in a semiconductor. Give a reason for your answer.
23. 5(b)(i)7 markshow much more time will it take to charge the new battery than the old battery?
24. 5(b)(ii)2 marksWhat must be the current rating on a new charger to accomplish this?
25. 6(a)6 marksDescribe the procedure she should use.
26. 6(b)(i)3 marksDescribe how electricity is generated using the process of hydroelectricity.
27. 6(b)(ii)6 marksDiscuss the rationale for the application of hydroelectricity as a viable alternative energy source in Dominica.