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Mention the conservation law violated in the following elementary particle reactions:
(i) \mu^- \rightarrow e^- + u_o
(ii) n \rightarrow p + e^-
(iii) k \rightarrow \pi^o + \pi^o
(iv) e^- + e^- \rightarrow \gamma
Explain the physical meaning of each term, write semiempirical mass formula for a nucleus. Find the value of atomic number of most stable nucleus for a given mass number A.
Explain the phenomenon of nuclear fission and obtain the expression for fissionability parameter. Show that the critical value of the fissionability parameter is 50.
Define parity for a quantum mechanical system. Describe an appropriate experiment proving the parity violation in weak interaction. How can the parity violation in weak interaction be understood ? Explain.
Write a comparative account of the following four processes: (i) \beta - decay (ii) positron emission (iii) electron capture (iv) inverse \beta- decay
Taking only the spin motion of electron, proton and neutron and assuming them as point particles, obtain their magnetic moments. How far the values thus obtained agree with experimental values? If not, why? Explain.
Explain why even-even nuclei are more stable than odd-odd nuclei.
State conservation laws obeyed by strong and weak interactions.
What is helicity of a neutrino? How is it measured?
Establish the necessary equation for the liquid drop model of a nucleus. How does it explain fission?
Explain parity violation in b decay.
Whet are the conservation jaws of elementary particles? How are these applied to Leptons and Baryons?
Describe and experiment that confirms the existence of neutrino.
What are weak interactions? Mention the various processes in which the weak interactions play a dominant role.
Write an essay on elementary particles with the following points: (i) Types of particles (ii) Quantum numbers (iii) Conservation laws (iv) Types of interactions
Describe in brief a linear accelerator. How are the lengths of linear accelerator tubes calculated? Name some particles for which this technique is applied and order of energies reached.
How is binding energy of the nuclei determined?
Describe the characteristics of strong nuclear force.
Write a short note on Nuclear fusion reactions.
What is the relation between decay constant, half life and mean life of a radioactive element?