LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
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M.Sc. DEGREE EXAMINATION – CHEMISTRY
FOURTH SEMESTER – APRIL 2007
CH 4952 – NUCLEAR & SOLID STATE CHEMISTRY
Date & Time: 25/04/2007 / 9:00 – 12:00 Dept. No. Max. : 100 Marks
PART – A
Answer all the questions. (10 x 2 = 20 marks)
- Give the unit cell parameters of (a) Monoclinic (b) rhombic systems
- What is a photovoltaic cell?
- Draw the solid state structures of (a) CdCl2 (b) SiO2
- What is a glide plane?
- Li+ doped in NiO is a good conductor. Explain.
- What are isotones? Give one example.
- What is the mechanism of g-ray emission?
- Define a Curie. How is it derived?
- Mention the principle involved in Geiger-Muller (GM) counter.
- State the nuclear spin of (a) (b)
PART – B (8 x 5 = 40 marks)
Answer any EIGHT questions.
- Write a note on Bravais lattices.
- Explain the “screw axis” and the operation involved.
- Write a note on photogalvanic cells.
- What are organic semiconductors? Explain their advantages.
- What are tungsten bronzes? Explain their properties.
- Discuss the inclusion compounds formed by graphite and their conducting
characteristics. - Write a note on scintillation counters.
- Discuss the principle and the construction of cyclotron.
- Write a note on chemical dosimeters.
- Describe the use of radioisotopes in medicine.
- Give the merits of the nuclear shell model of the nucleus.
PART – C (4 x 10 = 40 marks)
Answer any FOUR questions.
- Discuss the behaviour of high temperature superconductors. Explain the
Bardeen-Cooper-Schriefer (BCS) theory. - Describe the photoelectrocatalysis in splitting of water using TiO2 and SrTiO3.
- Explain the “atomic scattering factor” and “structure factor” in deriving the
electron density by Fourier transform method. - Derive the expression for binding energy of the nucleus using liquid drop model.
- Discuss the mechanism of a-ray emission from the nucleus.
- Discuss the fission yield curve. Discuss the energy involved and mechanism of
nuclear fission.