LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

   B.Sc. DEGREE EXAMINATION – PHYSICS

FIFTH SEMESTER – NOVEMBER 2010

PH 5507/PH 5504/PH 5500 – ATOMIC & NUCLEAR PHYSICS

 

 

 

Date : 29-10-10                     Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

PART – A

Answer ALL questions:                                                                                                       (10×2=20 Marks)

 

1. State Pauli’s exclusion principle.
2. Why is an inhomogeneous magnetic field required in Stern-Gerlach experiment?
3. Define isobar and isotope with examples.
4. Define packing fraction.
5. Write a note on magnetic moment of the neutron.
6. What is a chain reaction.
7. What are cosmic ray showers?
8. Write down the quark content of proton and neutron.
9. What is Larmor precession?
10. What is Mossbauer spectroscopy?

PART – B

Answer any FOUR questions:                                                                                             (4×7.5=30 Marks)

 

11. Explain the types of coupling schemes between the orbital and spin angular momenta. (4+3.5)
12. a) Define mass defect and binding energy.
13. b) Explain the variation of binding energy with mass number and discuss its salient

features.                                                                                                                                                (4+3.5)

13. Discuss the liquid drop model of a nucleus. 14. a) State the conservation laws obeyed by elementary particles.
14. b) Explain the conservation of baryon and lepton numbers with examples.   (3×2.5)                                                 Discuss the principles of NMR spectroscopy.

PART – C

Answer any FOUR questions:                                                                                              (4×12.5=50 Marks)

 

16. a) Distinguish between normal and anomalous Zeeman effects.                                                         (3)
17. b) Derive an expression for Lande’s splitting factor and explain the anomalous Zeeman
    effect for sodium doublet lines D₁ & D                                                                                                                           (9.5)
18. a) What is the range of an α particle and explain how it is determined experimentally?       (2+6.5)

 

1. b) What is the minimum energy required to break a ₂He⁴ nucleus into free protons and neutrons?

The masses of hydrogen atom, a neutron and the ₂He⁴ atom in a.m.u. are 1.007825, 1.008665 and

4.002603 respectively.                                                                                                                          (4)

18. Write a note on discovery properties and production of neutrons.                     (6.5+6)                      19.  Discuss the semi-empirical mass formula for a nucleus and explain different terms of it.
19. Explain in detail chemical shift and its measurement.                 (6+6.5)

 

 

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