LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PHYSICS

XC25

FIFTH SEMESTER – April 2009

PH 5504 – ATOMIC AND NUCLEAR PHYSICS

 

 

 

Date & Time: 16/04/2009 / 9:00 – 12:00       Dept. No.                                                       Max. : 100 Marks

 

 

PART-A

 

Answer ALL questions:                                                                             (10 x 2 = 20 marks)

 

1. What are the possible values for angular momentum in units of ħ for an electron in l = 1 state?
2. What is anomalous Zeeman effect?
3. State Geiger-Nuttal law.
4. Why should the spin of the neutrino have half integral value?
5. Give the Lawson criteria for nuclear fusion.
6. What are magic numbers?
7. Name the Four types of fundamental
8. What is Larmor precession?
9. What is the frequency of NMR radiation between two equally populated levels of spin ½ systems.
10. Name the types of quarks. Give the quark contents of proton and neutron.

 

PART-B

Answer any FOUR questions:                                                                   (4 x 7.5 = 30 marks)

 

11. Derive the expression for change in wave length due to Compton effect.
12. a). Describe the various components of a nuclear reactor. (6 Marks)

b). What is a breeder reactor?                                               (1.5 Marks)

13. Obtain the expression for transmission probability for alpha particles through a radioactive uclei..
14. Explain the Yukawa’s theory of nuclear forces, Establish that the particle which mediate the nuclear force is 275 times heavier than electron.
15. a). Discuss the effect of earth’s magnetic field on cosmic rays

b). What are Van Allen belts?

PART-C

Answer any FOUR questions:                                                                   (4 x 12.5 = 50 marks )

 

16. Describe Thompson’s parabola method to determine the e/m value for a positive ion. How does one find the ratio of masses for positive ions using this method?
17. Explain liquid drop model for the nucleus and hence arrive at the Weizacker binding energy formula for a nucleus.

 

 

 

18. a). Define the binding energy of a nucleus. (2)

b). Calculate the binding energy for a α- particle, Given m_p = 1.007276u , m_n= 1.008665u &

m_α = 4.001506 u. (3)

c). Discuss the binding energy per nucleon and packing factor verses mass number curves. (7.5)

 

19. a) Describe the shell model for nuclei. (5).

b). Discuss the classification of elementary particles. (5)

c).State various conserved quantities associated with elementary particle interactions.(2.5)

 

20. a) Describe the interaction between nuclear magnetic moment and the magnetic field and explain how this leads to NMR radiation. (6.5)

b). What is Chemical effect in NMR?. (3)

c). What is Mossbauer effect? (3)

 

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