{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

249 CT MS Student Version

249 CT MS Student Version - Section A(40 MCQ 1 2 3 4 E D A...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
(a) mv h = λ = 6.626 × 10 -34 / (6.0 × 10 -2 × 60 ) = 1.8406 × 10 -34 m mv h = λ = 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 where a = edge length of the unit cell and r = radius of the sphere a = 8 1/2 r Volume of the unit cell = a 3 = (8 1/2 r) 3 Volume of spheres in the unit cell = 4(4/3 πr 3 ) Volume occupied = [4(4/3 πr 3 )]/ (8 1/2 r) 3 Volume occupied = 0.740 = 74.0%
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}