LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034 B.Sc. DEGREE EXAMINATION – PHYSICS V SEMESTER – NOVEMBER 2003 PH 5500 / PHY 507 — atomic & nuclear physics   03-11-2003                                                                                                                                             100 Marks 1.00 – 4.00

 

PART – A

Answer All questions                                                                         (10 x 2 = 20 marks)

 

1. State and explain Pauli’s exclusion Principle.
2. What is normal Zeeman effect?
3. An x-ray machine Produces 0.1Å x – rays. What accelerating voltage does it employ?
4. What is Auger effect?
5. Determine the ratio of the radii of the nuclei ₁₃Al²⁷ and ₅₂Te¹²⁵
6. State Geiger-Nuttall Law.
7. Mention the properties of the nuclear force.
8. Explain latitude effects in Cosmic rays.
9. What are slow neutrons and fast neutrons?
10. Distinguish between Fluorescence and Phosphorescence.

 

PART – B

 

Answer any FOUR only                                                                (4 x 7 ½  = 30 marks)

 

11. Explain Frank and Hertz method of determining critical potentials.

 

12. a) Explain the origin of characteristic x-rays.            (3 ½  mark)

 

1. b) A ray of ultraviolet light of wavelength 3000 Å falling on the surface of a material

whose work function is 2.28 eV ejects an electron.

What will be the velocity of the emitted electron?                             (4 mark)

 

13. a) Show that the energy equivalent of 1 a m u is 931 MeV           (2 mark)

 

30. What is meant by binding energy of the nucleus. Find the binding energy and binding energy per nucleon of  of mass 30.973763 amu

M_H = 1.007825 amu and M_N = 1.008665 amu.                            (5 ½ mark)

 

14. What are elementary particles? How are they classified on the basis of their masses and interactions?

 

15. a) Distinguish between nuclear fission and fusion           (2 mark)

 

1. b) Explain with a neat diagram, the Bohr’s theory of Compound nucleus.

(5 ½ mark)

 

-2-

 

PART – C

 

Answer any FOUR only                                                               (4 x 12 ½ = 50 marks)

 

 

 

16. a) Describe Thomson’s parobola method to measure the specific charge of positive ions.                                                      (8 ½ marks)

 

1. In a Bainbridge mass spectrograph, singly ionised atoms of Ne²⁰ pass into the deflection chamber with a velocity of 10⁵ m/s. If  they are deflected by a magnetic field of flux density 0.08T, calculate the radius of their path and where Ne²² ions would fall if they had the same initial velocity.            (4 mark)

 

17. a) Explain compton scattering and derive an expression for the wavelength of the Scattered beam                                                                            (8 ½ mark)
18. b) Estimate the value of compton wavelengths when the scattered angles are (i) and (ii)                                                                                                   (4 mark)

 

18. Give the origin of b – ray line and continuous spectrum. Outline the theory of b – disintegration.

 

19. Describe the ‘liquid drop model’ of the nucleus. How can the semi – empirical mass formula can be derived from it? Mention the uses of this model.

 

20. a) Derive the four factor formula for a thermal nuclear reactor.            ( 8 ½ mark)

 

1. b) Calculate the power output of a nuclear reactor which consumes 10 kg of U – 235 per day, given that the average energy released per fission is 200 MeV.

(4 mark)

 

 

 

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             LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PHYSICS

FIFTH SEMESTER – APRIL 2006

                                                PH 5500 – ATOMIC & NUCLEAR PHYSICS

(Also equivalent to PHY 507)

 

 

Date & Time : 20-04-2006/AFTERNOON   Dept. No.                                                       Max. : 100 Marks

 

 

PART – A

 

Answer ALL the questions                                                             (10 ´ 2 = 20 marks)

1. State Pauli’s exclusion principle.
2. Distinguish between excitation and ionization potential of an atom.
3. A photon recoils back after striking an electron at rest. What is the change in the wavelength of the photon?
4. Find the minimum wavelength of x – rays produced by an x – ray tube operating at 1000 kV.
5. Define range and stopping power of a – particles.
6. Calculate the energy equivalent of 1 atomic mass unit.
7. Distinguish between nuclear fission and fusion.
8. What are magic numbers?
9. What is pair production?
10. What are the fundamental interactions in nature?

PART – B

Answer any FOUR questions                                                         (4 ´ 7.5 = 30 marks)

11. What is Zeeman effect? Derive an expression for Zeeman shift.
12. a) Explain the origin of characteristic x – rays.           (4.5)
13. b) State Mosely’s law? What is its importance?       (3)
14. a) What are isobars and isotones? Give one example for each (4)
15. b) Calculate the binding energy and binding energy per nucleon of Ca⁴⁰

Given,              mass of 1 proton = 1.007825 amu.

mass of 1 neutron = 1.008665 amu

mass of  = 39.96259 amu                                                         (3.5)

14. How was the neutron discovered? Give an account of its production and detection.
15. Discuss Yukawa’s meson field theory.

PART – C

Answer any FOUR questions                                              (4 ´ 12.5 = 50 marks)

16. a) Describe Thomson’s parabola method to measure the specific charge of positive ions.                                                                                  (8.5)
17. b) In a Bainbridge mass spectrograph, singly ionized atoms of Ne²⁰ pass into the     deflection chamber with a velocity of 10⁵ m/s. If they are deflected by a magnetic field of flux density 0.08T, Calculate the radius of their path and where Ne²² ions would fall if they had the same initial velocity.                     (4)
18. a) Explain millikan’s experimental verification of Einstein’s photoelectric equation.
19. b)   The wavelength of photoelectric threshold of Tungsten is 2300 .  Determine the kinetic energy of electrons ejected from the surface by ultraviolet light of wavelength 1800 .
20. Give the origin of b – ray line and continuous Spectrum. Outline the theory of b – disintegration.
21. a) Derive the four factor formula for the thermal nuclear reactor. (8.5)
22. b) A reactor is developing energy at the rate of 3000 kW.  How many atoms of U²³⁵ undergo fission per/second?  How many kilograms of U²³⁵ would be used in 1000 hours of operation assuming that on an average an energy of 200 in eV is released per fission?                                                                                  (4)
23. Describe the ‘liquid drop model’ of the nucleus. How can the semi-emirical mass formula be derived from it?  Mention the use of this model.

 

 

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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034                                   B.Sc. DEGREE EXAMINATION – PHYSICS

AC 09

FIFTH SEMESTER – NOV 2006

PH 5500 – ATOMIC & NUCLEAR PHYSICS

(Also equivalent to PHY 507)

 

 

Date & Time : 25-10-2006/9.00-12.00     Dept. No.                                                Max. : 100 Marks

 

 

 

PART – A

Answer ALL questions.                                                                     (10 x 2 = 20 Marks)

1. Define excitation potential and ionization potential of an atom.
2. What is Paschen-Back effect?
3. State Mosley’s law.
4. Describe how a photo-multiplier tube functions.
5. Explain parity of nuclei.
6. Define nuclear fission with example.
7. What is chain reaction?
8. What are pair production and annihilation?
9. What are cosmic rays?
10. Define range of alpha-particle.

PART – B

Answer any FOUR questions.                                                           (4 x 7.5 = 30 Marks)

11. a. Discus the normal Zeeman effect. (4.5)
12. Calculate the wavelength separation between the two component lines which

are observed in the normal Zeeman effect. The magnetic field used is 0.4    weber/m²;

the specific charge is 1.76×10¹¹ C kg^-1 and l = 6000 Å .        (3)

12. State and explain the laws of photoelectric effect.
13. Classify nuclei as isotopes, isobars, isotones, isomers, and mirror nuclei – Give examples.
14. Explain Bohn and Wheeler theory of nuclear fission and estimate the energy released when a neutron breaks into proton and electron.
15. Explain the latitude, East-West, and altitude effect of cosmic rays.

 

PART – C

Answer any FOUR questions.                                                           (4 x 12.5 = 50 Marks)

16. a. Describe the construction of Aston’s Mass Spectrograph with necessary theory

and show how it can be used in the detection of isotopes.                (8+4.5)

1. What are the advantages and limitations of Aston’s Mass Spectrograph? (p.54)
2. a. Derive Einstein’s photo-electric equation and describe Millikan’s experiment, with theory, to verify the same.
3. The photoelectric threshold for a metal is 3000 Å. Find the kinetic energy of an electron ejected from it by radiation of wavelength 1200 Å.

(Given: h = 6.62×10^-34 Js and c=3×10⁸ ms^-1.)                          (9+3.5)

18. What is nuclear magneton? Describe Rabi’s method to determine nuclear magnetic

moment.

19. Explain proton-proton and carbon-nitrogen cycle of thermo nuclear fusion.
20. a. Explain shell model of the nucleus.
21. Calculate the atomic number of the most stable nucleus for a given mass number A.                                                                                                                              (8+4.5)

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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

           B.Sc. DEGREE EXAMINATION – PHYSICS

FG 21

FIFTH SEMESTER – APRIL 2008

PH 5500 – ATOMIC & NUCLEAR PHYSICS

 

 

 

Date : 28-04-08                  Dept. No.                                        Max. : 100 Marks

Time : 1:00 – 4:00

PART-A

Answer ALL questions.                                                        (10×2=20 marks)

1. What are the limitations of Thomson’s parabola method?
2. Write down the electronic configuration of N_a and Cl.
3. What is photo electric effect?
4. Calculate the work function of sodium in e^V, given threshold wavelength is 6800Å.
5. Explain the terms: (i) Isotone              (ii) Isomer
6. Calculate the binding energy in M_ev of deutron.

Given:             Mass of  & mass of amu.

and mass of amu.

1. Why are neutrons moderated in nuclear reactors?
2. What are magic numbers?
3. What are cosmic rays?
4. Mention any two properties of nuclear forces.

 

PART-B

Answer any FOUR questions.                                                         (4×7.5=30 marks)

1. Describe Franck-Hertz experiment for determining the critical potentials.
2. Describe L-S and J-J coupling schemes.                                 –(4+3.5)
3. a) Mention any five properties of gamma rays.                      –(5)

1. b) Alpha particles from polorium travel along a semicircle of radius 20cm in a magnetic field of 1.763 wb/m². Find the velocity and energy of the particles. e/m of and mass of

1. Give an account of any three sources of neutron.                  –(3×2.5)
2. a) Explain Yukawa’s meson theory of nuclear forces.           –(4)

3. b) How does the intensity of cosmic ray varies with attitude? –(3.5)

 

PART-C

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

1. a) Explain the principle and experimental arrangement of stern-Gerlach in support of spatial quantisation.                                                             —(4+6)

2. b) Why it is necessary to use a beam of neutral atoms and not of ions in this experiment? —(2.5)

1. a) Derive an expression for the change in wavelength of a pholon in complon scattering.    —(9)

1. b) Pholon of energy 1.02 MeV undergoes Compton scattering through 180⁰.Calculate the wavelength of scattered pholon. —(3.5)

1. a) Give the origin of the B-ray line and continuous spectrum. —(5+5)

1. b) Calculate the binding energy of a neutron in the

and .                                    —-(2.5)

1. a) Derive the four factor formula for a thermal nuclear reactor. —(9.5)

1. b) Calculate the energy released when 1 kg of U²³⁵ undegoes nuclear fission. Assume energy per fission is 200 MeV. —(3)

1. Obtain an expression for binding energy of a nucleus based on the semi-empirical mass formula

—-(12.5)

 

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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PHYSICS

CC 09

FIFTH SEMESTER – November 2008

PH 5504 – ATOMIC AND NUCLEAR PHYSICS

 

 

 

Date : 03-11-08                     Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

SECTION – A

Answer All the questions.                                                                                           (10×2 = 20 Marks)

1. State and explain Pauli’s exclusion principle.
2. What is meant by spin-orbit interaction?
3. What are isobars? Give an example.
4. State Geiger – Nuttal law.
5. Explain briefly cross-section of reactions.
6. What do you know about the magnetic moment of a neutron?
7. What are hard and soft components of cosmic rays?
8. What are Hyperons?
9. What is meant by Nuclear Magnetic Resonance?
10. Define Relaxation time with respect to nuclear spin energy.

 

SECTION – B

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

 

11. Describe Dunnigton’s method for the determination of e/m of electron.
12. (a). Define: (i) Mass defect, (ii) Binding energy and  (iii) Packing fraction.            (4.5 marks)

 

(b) The masses of the hydrogen atom and of neutron are 1.008142 and 1.008982

amu respectively. Calculate the binding energy and packing fraction per nucleon

of  ¹⁶O nucleus if its atomic mass is 15.994915 amu.                                         (3 marks)

 

13. (a). Explain nuclear fission and chain reaction?                                     (5¹/₂ marks)

(b). When a U-235 nucleus undergoes fission, 200 MeV energy is released. How much energy

in joules will be released when 1 g of U –235 is fissioned?                                          (2 marks)

 

14. What are cosmic ray showers? Discuss qualitatively the mechanism of their origin.
15. What is Mössbauer effect? Explain the experimental arrangement to study Mössbauer effect.

 

SECTION – C

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

16. (a) What is Compton effect? Derive an expression for the change in wavelength of the scattered

photon using quantum theory.                                                                              (10.5 marks)

(b)  Calculate the Compton wavelength.                                                                     (2 marks)

17. (a) Give an account of the β – ray spectrum. Explain the neutrino hypothesis to understand the spectrum.                                                 (10 marks)

(b) Explain inverse β – decay.                                                                                      (2.5 marks)

18. How was neutron discovered? Give an account of its properties and also production and detection techniques.
19. Describe the liquid drop model of the nucleus. Obtain an expression for the binding energy of a nucleus on the basis of semi-empirical mass formula of Weizsäcker.
20. Explain, in detail, the characteristics of NMR spectra.

 

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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PHYSICS

CC 15

FIFTH SEMESTER – November 2008

PH 5500 – ATOMIC & NUCLEAR PHYSICS

 

Date : 03-11-08                        Dept. No.                                          Max. : 100 Marks

Time : 9:00 – 12:00

PART – A

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

 

1. Why do the traces of parabola in Thomson’s method not pass through the origin?
2. State the advantages of Aston’s mass spectrograph.
3. The K_α line of molybdenum has a wavelength of 0.7078Å.Calculate the wavelength of the K_α line of copper. Atomic number of molybdenum is 42 and of copper is 29.
4. The photoelectric threshold for a metal is 3000Å. Find the kinetic energy of an electron ejected from it by radiation of wavelength 1200 Å.
5. What are isotones and isotopes?
6. Calculate the binding energy in MeV of deutrons. Given, mass of ₁H¹=1.008145amu,

mass of ₀n¹1.008987amu and mass of ₁H²=2.014741amu.

7. A reactor is developing energy at the rate of 32×10⁶ How many atoms of U²³⁵ undergo fission per sec? Assume that on the average an energy of 200 MeV is released per fission.
8. Distinguish between slow and fast neutrons.
9. What are cosmic rays?
10. What are particles and antiparticles? Give two examples.

 

PART – B

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

 

11. Explain the two types of coupling schemes between the orbital and spin angular momenta.
12. Explain the different types of photoelectric cells and their action.
13. a) Explain mass defect and binding energy.                (3)
14. b) Explain the variation of binding energy with mass number and discuss its salient

features.                                                                                                                                                              (4.5)

14. a) What do you mean by chain reaction?                                                                             (2.5)
15. b) Explain controlled and uncontrolled chain reaction.                                                                             (5)
16. a) Explain the main features of shell model of a nucleus.          (5)
17. b) What are magic numbers?                                                                                                                    (2.5)

PART – C

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

 

16. a) Describe Stern-Gerlach experiment. Discuss its significance.                        (10)
17. b) Why is an inhomogeneous magnetic field required in the experiment?                 (2.5)
18. a) Explain Millikan’s experimental verification of Einstein’s photoelectric equation.  (10)
19. b) Photon of energy 1.02MeV undergoes Compton scattering through 180°. Calculate the

wavelength of scattered photon.                                                                                                             (2.5)

18. a) Give the origin of β -ray line and continuous spectra.                                                                         (10)
19. b) Find out the stable nucleus that has a radius half of Fe⁵⁶.                                                                      (2.5)
20. Describe the construction and working of a nuclear reactor.
21. Discuss the latitude,altitude and east-west effects of cosmic rays. Plot the concerned

graphs.

 

 

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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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   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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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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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)

1. Write down the quantum numbers of the electrons occupying the K shell.
2. What is Compton Effect?
3. State the differences between Isotopes and Isobars.
4. State the Geiger -Nuttal law. Draw the graph that represents it.
5. Write a short note on nuclear chain reaction.
6. What is meant by nuclear fusion? Give an example.
7. State any two properties of Nuclear forces.
8. What are quarks? How are the proton and meson made up from quarks?
9. What is meant by Larmor precession?
10. What is Mossbauer effect? Give any one of its important applications.

                                                                    PART-B

Answer ANY FOUR  Questions:                                                                      (4X7.5=30 marks)

11. Describe the Stern and Gerlach experiment.
12. i) Write short note on  Packing fraction.                                                                (3.5marks)
13. ii) Define Nuclear Magneton. Calculate its value.                                                 (4marks)

 

13. Explain about Neutron sources in detail.

 

14. What are cosmic showers? Discuss the theory of their formation.

 

15. What is meant by chemical shift in NMR? Explain how it can be measured?

 

PART–C

 

Answer ANY FOUR Questions:                                                                          (4×12.5 = 50marks)

 

16. a) Describe Thompson’s parabola method. Discuss its limitations.      (7 marks)

 

5. b) Explain Anomalous Zeeman Effect.                                                                (5.5 marks)

 

17. Explain:  i) Beta ray spectra                                                                         (4.5 marks)
18.               ii) Inverse beta decay                                                                    (4 marks)

iii) Detection of neutrino.                                                             (4 marks)

 

18. i) Derive the four factor formula for nuclear fission.             (6.5 marks)
19. ii) Discuss the Bohr Theory of compound nucleus.                        (6 marks)

 

 

19. i) List out any five similarities between a liquid drop and a nucleus.       (5 marks)

 

1. ii)  Deduce the semi-empirical mass formula to find binding energy of the

nucleus.                                                                                                                 (7.5marks)

 

20. i) Describe the interaction between Nuclear magnetic moment and applied

external magnetic field.                                                                                        (7.5 marks)

 

1. ii) Discuss the important applications of NMR Spectroscopy.        (5 marks)

 

 

 

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