BSc Sem VI 2022 2023 Apr 2023 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) (a) Explain how a magnetic spectrograph can be used to determine the 10 velocity of alpha particles?
   • b) Write a short note on Geiger Nuttal law and discuss its significance
   • (ii) the origin of short range a-particles using the decay scheme. 10
   • (iii) What is Pauli’s neutrino hypothesis? Also explain continuous 10
   • (iv) Derive the energy conditions under which different types of 10 can take place
2. Q2 Attempt any two
   • (i) What is gamma decay? Explain the selection rules for gamma decay. 10 Also discuss Gamma ray spectra
   • (ii) Discuss Mossbauer effect with experimental setup. State the 10 applications of Mossbauer effect
   • (iii) From the Bohr-Wheeler theory obtain the stability limit against 10 diagram indicating the variation of contribution of different energy terms to the binding energy per nucleon with respect to mass number
3. Q3 Attempt any two
   • (i) Explain Nuclear Chain Reaction. What are the various factors on 10 which it depends?
   • (ii) What is Nuclear Reactor? Explain its various features. 10
   • (iii) | Describe the construction and working of Betatron. 10
   • (iv) Discuss in detail the principle, construction and working of Cyclotron. 10
4. Q4 Attempt any two
   • (i) Summarize the important experimental properties of the deuteron. 10
   • (ii) State conservation laws for the various properties of elementary 10 Which of the following reactions can occur by conservation laws of elementary particles? If not, state the conservation principles violated
   • (iii) Write note on electrons, positrons and their anti particles. 10
   • (b) Explain Yukawa potential
   • (iv) Explain qualitatively the Quark model. 10
5. Q5 Attempt any four
   • (i) decays by a — emission to The alpha disintegration energy 05 is 4.863 MeV. Calculate the kinetic energy of the alpha particle
   • (ii) meant by electron capture? 05
   • (iii) | Explain the phenomenon of internal conversion. 05
   • (iv) Write short note on shell model of nucleus. 05
   • (v) the amount of energy available if 10gm of is 05 completely fissioned. Given: Energy per fission = 200 MeV, and
   • (vi) | Protons are accelerated in a 100cm cyclotron. The oscillator frequency 05 is 10 Megacycle. Calculate the magnetic field needed for the protons Also calculate the energy required for acceleration of ions Given: e = Mass of proton m =1.67 x kg
   • (vii) On the basis of the meson theory, estimate the mass of the exchanged 05 particle if the 'range' of the potential is m?
   • (viii) Show that lepton number and baryon number is conserved in case of 05 neutron to ( ) decay

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