LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
M.Sc. DEGREE EXAMINATION – CHEMISTRY
|
SECOND SEMESTER – APRIL 2006
CH 2952 – NUCLEAR AND RADIOCHEMISTRY
Date & Time : 26-04-2006/9.00-12.00 Dept. No. Max. : 100 Marks
Part A
Answer the following 10´2 = 20
- What are isotones? Give an example.
- What is nuclear quadrupole moment?
- Mention the nuclear spin of (a) 12C (b) 2H .
- What is internal conversion?
- Give the mechanism of positron emission.
- How is the odd – even rule useful in predicting stability of a nucleus?
- Show that t1/2 = 693/λ
- How are thermal neutrons obtained?
- What is the final product obtained if 2 α and 4 β– particles are emitted from 236U?
- Explain tunneling effect.
Part B
Answer any eight of the following: 8´5 = 40
- Write a note on nuclear forces.
- Discuss the stability of the nucleus based on n/p ratio.
- Discuss the principle of Dempster mass spectrograph.
- Write a note on proportional counters.
- What is double β decay?
- What mass of 14C with t1/2 = 5730y has an activity equal to one curie?
- How is radius of a nucleus deduced? Calculate density of 81
- What is electron capture? What are its consequences?
- Why are the atomic weights of elements found in fraction?
- What is the significance of interaction of radiation with water?
- What is the principle of isotope dilution analysis? What are the disadvantages of this technique?
- Write a note on use of radio isotopes in determination of mechanism of a reaction.
Part C
Answer any four of the following: 4´10 = 40
- How is binding energy calculated theoretically using liquid drop model?
- Describe the mechanism of β decay emission. Explain the forbidden and allowed transitions of β decay using Kurie plot.
- Write a note on (a) Geiger Counter (b) Scintillation counter
- Discuss the use of nuclear shell model in explaining magic numbers.
- How is the factor binding energy per nucleon significant in deciding stability of a nucleus?
- Discuss working of a nuclear reactor.
Latest Govt Job & Exam Updates: