LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

M.Sc. DEGREE EXAMINATION – CHEMISTRY

LM 43

FOURTH SEMESTER – APRIL 2006

                                    CH 4952 – NUCLEAR AND SOLID STATE CHEMISTRY

(Also equivalent to CH 4802)

 

 

Date & Time : 22-04-2006/9.00-12.00         Dept. No.                                                       Max. : 100 Marks

 

 

Part A

Answer the following                                                                             10×2 = 20

1. What are unit cell parameters of (i) triclinic (ii) hexagonal?
2. What is ‘123’ oxide? Mention its significance.
3. Mention the number of space lattices and space groups in two and three dimensional lattices.
4. What is piezoelectric effect? Cite two examples of piezoelectric crystals.
5. Give two examples for organic semiconductors. Cite two advantages of them.
6. What is the significance of n/p ratio?
7. How do radio particles come out of the nucleus without spending activation energy?
8. What is the unique behaviour of ¹⁰B? How is this behaviour useful in nuclear reactors?
9. What is the mechanism of γ – emission?
10. Show that t_1/2 = 693/λ

 

Part B

Answer any eight of the following:                                                       8×5 = 40

11. Describe the operations that produce improper axis.
12. Write a note on space groups.
13. How is photoelectriccatalytic splitting of water carried out?
14. How are semiconductors used in the photovoltaic cell?
15. What is Kammerlingh – Onnes experiment? Write a note on Type I superconductors.
16. Discuss the Debye theory on the heat capacity of solids.
17. Explain the nature of forces in operating in the nucleii.
18. Describe ranges of various radio particles.
19. Why are the mass numbers of stable isotopes of chlorine and copper not continuous but are alternate numbers?
20. What is hot atom chemistry? Explain Szillard – Charmers process and its application.
21. What is the principle of neutron activation analysis? What are the disadvantages of this technique?
22. Write a note on cold fusion.

Part C

 

Answer any four of the following:                                                        4×10 = 40

23. Describe the one dimensional conducting in (SN)_x and partially oxidized [Pt(CN)₄]^2-.
24. Discuss the Fourier synthesis in obtaining electron charge density in the crystal structure analysis.
25. Discuss the iron – thionine and Ru³⁺– bipyridyl systems in their photovoltaic behaviors.
26. Discuss the use of nuclear shell model in explaining magic numbers.
27. How is signal size in a charged particle counter affected by applied potential?
28. Discuss working of a nuclear reactor.

 

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