Physics 30 June 2000 Diploma Exam

93 69 polonium 20898 84 tellurium 12760 52 selenium

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Unformatted text preview: 1.01 1 2 IIA 1 IA Periodic Table of the Elements Fold and tear along perforation. Tear-out Page Tear-out Page No marks will be given for work done on this page. mm 10 20 30 40 50 70 Fold and tear along perforation. 60 80 90 100 110 120 130 140 150 160 170 180 190 200 210 5 No marks will be given for work done on this page. Physics 30 June 2000 Diploma Examination Multiple Choice and Numerical Response Keys 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. C B B C D D C C A D B A D C C B C C D 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. 36. 37. B D A A D B A C A A C D D D B A D A 1. 3.55 2. 5.56 3. 1.54 4. 7.52 5. 5.62 or 5.63 6. 8.6 7. 1.22 8. 2252 9. 1493 10. 1221 11 3124 12 7.24 or 7.25 NR1 is linked to MC4: MC4 A —2.94, B—1.47, C—3.55, D—1.78 NR5 is linked to MC11: A—2.83 or 5.64, B—5.62 or 7.95, C—1.13, D—2.25 or 1.59 MC28 is linked to MC27: 27A—C, B—B, C—A, D—D Physics 30 June 2000 Diploma Examination Multiple Choice and Numerical Response Keys Question 1 2 3 4 NR1 NR2 NR3 5 6 NR4 7 8 9 10 11 NR5 12 13 14 15 NR6 16 17 NR7 NR8 18 19 NR9 20 21 NR10 22 23 24 25 26 27 28 NR11 29 NR12 30 Key C B B C 3.55 5.56 1.54 D D 7.52 C C A D B 5.62 or 5.63 A D C C 8.6 B C 1.22 2252 C D 1493 B D 1221 A A D B A C A 3124 A 7.24 or 7.25 C Skill STS * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * GLE 2 2 2 2 2 2 2 2 2 2 2 2 2 2 3 3 2 2 3 4 2 3 2 2 2 3 3 3 3 4 1 2 1 3 4 2 2 4 4 4 2 31 32 33 34 35 36 37 WR1 WR2 Skill 5% Skill 7% D D D B A D A * GLE1 5% STS 15% GLE2 10% GLE4 15% * * * 4 4 4 4 3 4 4 Sample Solution for Written Response Question Two Luminosity Versus Time (Title) 1.00 0.9 0.8 0.7 0.6 Luminosity (1035 W) 0.5 0.4 0.3 0.2 0.1 0 0 50 100 150 200 Time (d) 250 300 350 • Decay Based on the lines drawn above at 0.5 and down to 75 days, the half-life of the luminosity is 75 days. The closest half-life in the table is the decay of cobalt-56 into iron-56 with a half-life of 77.3 days. • No = 1.49 × 1029 kg N = 1.86 × 1028 kg t1/2 = 6.1 days 1.49 × 1029 ÷ 2 ÷ 2 ÷ 2 = 1.86 × 1028 kg Therefor 3 half-lives have expired. Total time = 3 × 6.1 d = 18 days • 60 26 Fe → 60 27 Co + 0 −1 e A beta particle is emitted. • Photons with the shortest wavelength have the highest energy. So, the decay chain, 26 5 y Al 7.1×10→ 26 Mg gives the shortest wavelengths. E = 1.809 MeV = 2.894 × 10–13 J λ = hc = E (663 × 10−34 J •s)(300 × 108 m/s) . . 2894 × 10−13 J . λ = 6.87 × 10–13 m...
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