249 CT MS Student Version

249 CT MS Student Version - Section A (40 %): MCQ 1. 2. 3....

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Section A (40 %): MCQ 1. E 5. C 9. C 13. B 2. D 6. A 10. B 14. A 3. A 7. A 11. D 15. D 4. C 8. D 12. E 16. C Section B (60 marks): Short Questions Answer ALL questions. Write your answers in the spaces provided. 1. (a) - × = - 2 2 2 1 1 1 10 179 . 2 n n J E 18 where n 1 and n 2 are principal quantum numbers. Lyman series: n 1 = 1 ; n 2 = 3 ΔE = hν = 1.937 x 10 -18 J frequency of the photon = 2.923 x 10 15 s -1 (b) 2. 1 n =1
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mv h = λ = 6.626 × 10 -34 / (6.0 × 10 -2 × 60 ) = 1.8406 × 10 -34 m mv h = = 6.626 × 10 -34 / (9.11 × 10 -31 × 60 ) = 1.2122 × 10 -5 m (b) the wavelengths of a tennis ball and an electron moving at the same velocity are 1.8406 × 10 -34 m (very small) and 1.2122 × 10 -5 m (magnitude in the range of infrared region) respectively. This implies wave properties are observable and hence important for submicroscopic objects only. (c) Structure of the F. C. C C.N. = 6(1/2) + 8(1/8) = 4 2a 2 = (4r) 2
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This note was uploaded on 02/22/2012 for the course CHEM yscn0027 taught by Professor Drtong during the Fall '10 term at HKU.

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249 CT MS Student Version - Section A (40 %): MCQ 1. 2. 3....

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