BSc Physics SEM VI 2018 19 May 2018-19 PHYSICS NUCLEAR PHYSICS Question Paper - Mumbai University | munotes

Questions asked in this paper

• (2) Figures to the right indicate full marks

1. Q1 Attempt any two:
   • (i) What do you understand by the term transmission probability? Obtain an expression 10 for the transmission probability of the a-particle through a rectangular barrier
   • (ii) Discuss the salient features of beta decay spectrum. How continuous nature of beta 10 ray spectrum leads to the violation of laws of conservation of energy and momentum Explain how the paradox was resolved
   • (iii) State Geiger-Nuttal law. Explain the origin of short range and long range a particles 10
2. Q2 Attempt any two:
   • (i) What are nuclear isomers? Discuss the nuclear isomerism of bromine. 10
   • (ii) Discuss the contribution of different energy terms to binding energy and obtain 10 Weizsacher’s semi-empirical mass formula. Draw a neat diagram indicating the variation of contribution of different energy terms to the binding energy per nucleon with respect to mass number A
   • (iii) Mossbauer with experimental setup. State the importance of 10
3. Q3 Attempt any two:
   • (i) Explain Breeder reactor? What are its advantages? 10 What is natural fusion? Explain energy productions in stars using carbon cycle. 10
   • (iii). Why are accelerators required in Nuclear Physics? Describe the Van De Graff 10
4. Q4 Attempt any two:
   • (i) Describe the four types of elementary particle interactions. 10
   • (ii) (a) Summarize the important experimental properties of the deuteron. 10
   • (b) Write the basic properties of neutron, neutrinos and their anti particles
   • (iii) . Explain meson theory of nuclear Force. Using Heisenberg’s uncertainty principle, 10 estimate the mass of meson (Given: range of the potential is m, h = 1.054571 x 10** J.s)
5. Q5 Attempt any four:---(5 marks each) 20 marks
   • (i) Compute the kinetic energy of alpha particles emitted from nucleus. The atomic mass of and alpha particle are 232.1095 amu, 228.0998 amu and 4.0039 amu respectively. Comment on the answer obtained
   • (ii) 3Li’ and 4Be’ have atomic masses 7.016005 amu and 7.016929 amu. Which of them show and of what type? Calculate Q value for it. Atomic masses of Lithium and Beryllium respectively are: M (3Li’)=7.016005 amu, (ili) For the isobaric families with A = 45 and A= 48, estimate the nuclear charge Zo for the most stable isobar in each case
   • (iv) | What do you mean by mirror nuclei? Determine the mass difference between two
   • (v) Protons are accelerated in a 100 cm cyclotron. The oscillator frequency is 10 megacycles. Calculate the magnetic field needed and the maximum energy that can be given to the proton
   • (vi) the amount of energy available if 60 gm of is completely fissioned Given: Energy per fission of is 200.5 MeV
   • (vii) Which of the following reactions can occur by conservation laws of elementary particles? If not, state the conservation principles violated by the others
   • (viii) Explain Yukawa potential

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