LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PHYSICS

XC 19

FIFTH SEMESTER – April 2009

PH 5500 – ATOMIC & NUCLEAR PHYSICS

 

 

 

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

 

 

PART A

Answer all questions.  All questions carry equal marks.                           (10 x 2 = 20 marks)

1. Define excitation potential.
2. State Pauli’s exclusion principle.
3. What is photoelectric effect?
4. Find the minimum wavelength of x-rays produced by an x-ray tube operated upon 1000V.

(h = 6.625 x 10^-34 JS,  e = 1.602 x 10^-19c,   c = 2.998 x 10⁸ m/s)

5. Define mass defect and packing fraction.
6. State Geiger-Nuttal law.
7. Define half-life period.
8. Distinguish between controlled and uncontrolled chain reaction?
9. Write the expression for semi empirical mass formula.
10. What are cosmic ray showers?

 

PART B

Answer any four questions.                                                                         (4 x 7.5 = 30 marks)

11. Describe Aston’s mass spectrograph.
12. The wavelength of L_α x-ray line platinum (atomic no.78) is 1.321Å . An unknown substance

emits L_α X-rays of wavelength 4.174Å .  Calculate the atomic number of the unknown

substance.  Given b = 7.4 for L_α lines.

13. Using Rabi’s method how nuclear magnetic moment is determined?
14. Explain the methods of detection of neutron.
15. Explain yukawa’s meson theory of nuclear forces.

 

PART C

Answer any four questions.                                                                         (4 x 12.5 = 50 marks)

16. a)Describe the Stern and Gerlac experiment and indicate the importance of the results

obtained.                                                                                                                                         (10)

b)Distinguish between anomalous and normal Zeeman effect.                                            (2.5)

17. Explain the different types of photoelectric cells and mention their uses. (4+4+4.5)
18. Explain the theory of β decay in detail.
19. a) Describe the construction and explain the function of nuclear reactor. (9)
20. b) Fine the energy released in fusion during the formation of helium nuclei.

₁H² = 2.014102 amu   ₂He⁴ = 4.002604 amu.                                                                   (3.5)

20. a) Explain the classification of elementary particles. (8)
21. b) Discuss the conservation laws.     (4.5)

 

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