LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
B.Sc. DEGREE EXAMINATION – PHYSICS
FIFTH SEMESTER – APRIL 2012
PH 5507/PH 5504/5500 – ATOMIC & NUCLEAR PHYSICS
Date : 25-04-2012 Dept. No. Max. : 100 Marks
Time : 9:00 – 12:00
PART-A
Answer All Questions: (10×2=20 marks)
- Write down the quantum numbers of the electrons occupying the K shell.
- What is Compton Effect?
- State the differences between Isotopes and Isobars.
- State the Geiger -Nuttal law. Draw the graph that represents it.
- Write a short note on nuclear chain reaction.
- What is meant by nuclear fusion? Give an example.
- State any two properties of Nuclear forces.
- What are quarks? How are the proton and meson made up from quarks?
- What is meant by Larmor precession?
- What is Mossbauer effect? Give any one of its important applications.
PART-B
Answer ANY FOUR Questions: (4X7.5=30 marks)
- Describe the Stern and Gerlach experiment.
- i) Write short note on Packing fraction. (3.5marks)
- ii) Define Nuclear Magneton. Calculate its value. (4marks)
- Explain about Neutron sources in detail.
- What are cosmic showers? Discuss the theory of their formation.
- What is meant by chemical shift in NMR? Explain how it can be measured?
PART–C
Answer ANY FOUR Questions: (4×12.5 = 50marks)
- a) Describe Thompson’s parabola method. Discuss its limitations. (7 marks)
- b) Explain Anomalous Zeeman Effect. (5.5 marks)
- Explain: i) Beta ray spectra (4.5 marks)
- ii) Inverse beta decay (4 marks)
iii) Detection of neutrino. (4 marks)
- i) Derive the four factor formula for nuclear fission. (6.5 marks)
- ii) Discuss the Bohr Theory of compound nucleus. (6 marks)
- i) List out any five similarities between a liquid drop and a nucleus. (5 marks)
- ii) Deduce the semi-empirical mass formula to find binding energy of the
nucleus. (7.5marks)
- i) Describe the interaction between Nuclear magnetic moment and applied
external magnetic field. (7.5 marks)
- ii) Discuss the important applications of NMR Spectroscopy. (5 marks)
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