BSc Physics SEM VI ATKT Oct 2018 ATKT PHYSICS II NUCLEAR PHYSICS Question Paper - Mumbai University | munotes

Questions asked in this paper

• (2) Figures to the right indicate full marks

1. Q1 (a) Attempt any one:
   • (i) is alpha decay paradox? Obtain an expression for the transmission 10 probability of the a-particle through a rectangular barrier
   • (ii) Discuss the salient features of beta decay spectrum. How continuous nature 10 of beta ray spectrum leads to violation of laws of conservation of energy and momentum? Explain how the paradox was resolved
   • (b) Attempt any one: decays with half life of 60.5 min by emitting 5 groups of alpha 5 particles with energies 6.08 MeV, 6.04 MeV, 5.62 MeV, 5.60 MeV. Calculate alpha disintegration energies and sketch the energy level
   • (ii) Why is favored over electron capture. 5
2. Q2 (a) Attempt any one:
   • (i) Explain what is Mossbauer effect? Draw and describe the schematic 10 arrangement of Mossbauer’s experiment in detail
   • (ii) What is liquid drop model of Nucleus? Write down the similarities between 10 a nucleus drop of liquid. What are the outcomes and limitations of the
   • (b) Attempt any one:
   • (i). a note on magic numbers in the nucleus. 5 the stability limit against spontaneous fission, > 52. 5
   • (a) Attempt any one: Explain the significance of carbon cycle in the process of energy production 10 in stars. Give an account of controlled fusion as a source of energy on earth Gi) construction and working of Van de Graff generator in detail. 10 20BE3C4B76762B397A54AB3C6B 1 FF80D
   • Q.P. Code: 52274
   • (b) Attempt any one:
   • (i) in brief the process of asymmetric fission. 5
   • (ii) | How many neutrons will be there in the hundredth generation if the fission 5 process starts from 1000 neutrons and k=1.05
3. Q4 (a) Attempt any one:
   • (i) Discuss Yukawa’s meson exchange theory of nuclear force. Estimate the 10 mass of meson using uncertainty principle. What is Yukawa potential?
   • (ii) What are particles and antiparticles? Write about the discovery and 10
   • (b) Attempt any one:
   • (i) Give the classification of elementary particles in terms of bosons and 5
   • (ii) Write the properties of u,d and s quark. Explain the structure of proton 5 and neutron in terms of quarks
4. Q5 (a) Attempt any one:
   • (i) Calculate the K.E. of particle in the following decay 4 The atomic mass of and a particle are 211.991876 u,
   • (ii) 3Li’ and 4Be’ have atomic masses 7.016005 u and 7.016929 u respectively. 4 Which of them show and of what type? Calculate Q value for the
   • (b) Attempt any one:
   • (i) TI? atoms resulting from B-decay of atoms emit four groups of 4 conversion electrons with kinetic energies 266.3, 264.2, 263.6 and 193.3Kev. The electron binding energies in the K, Ln and Lin shells are 85.7, 15.4,14.8 and 12.7 Kev respectively. Calculate the energies of y quanta concurrent with the decay
   • (ii). For the isobaric family A=91, obtain the nuclear charge zo of the most stable 4 20BE3C4B76762B397A54AB3C6B 1 FF80D
   • Q.P. Code: 52274
   • (c) Attempt any one:
   • (i) Protons are accelerated in a 100cm cyclotron. The oscillator frequency is 4 10 Megacycle. Calculate the magnetic field needed for the protons Given: e = 1.6 x Mass of proton M = 1.67 x
   • (ii) Calculate the amount of energy available if 1 gm of 92U?*is a completely 4 fissioned. Given that the energy per fission 200MeV
   • (d) Attempt any one:
   • (i) State lepton and baryon number conservation law. Identified whether the 3 following elementary particle reaction are allowed or forbidden,
   • (ii) A pion of mass 134 MeV/c? at rest decays by weak interaction into muon of 3 rest mass 102 MeV/c? and an antineutrino. If the rest energy of antineutrino is zero, calculate the total kinetic energy of muon and antineutrino 20BE3C4B76762B397A54AB3C6B 1 FF80D

Read from the scan above, so a character or two may differ. The scan is the original.